{"title":"Contrast Sensitivity Tests","description":null,"products":[{"product_id":"tumbling-e-low-contrast-flip-book","title":"Tumbling \"E\" Flip Book","description":"\u003cp\u003eNotations in M letter sizes ranging from 20M to 1.6M for testing at various distances. Each page it's own contrast level at 100%, 2.5% and 1.25%. This flip book is great for vision studies and research world wide. The Tumbling \"E\" vision chart uses only one optotype for testing. Patients not familiar with the Roman alphabet simply have to gesture or sign which direction they see the \"E\" facing. This is a helpful test for patients that are illiterate or mute, also. This Tumbling \"E\" flip book contains three contrast levels for accurate sensitivity screening.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921479327905,"sku":"2380","price":262.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/19f9cefdfb07230a68581d617885a3af_XL.jpg?v=1776157124"},{"product_id":"multi-contrast-sloan-letter-flip-book","title":"SLOAN Letter Flip Book","description":"\u003cp\u003eNotations in M letter sizes ranging from 20M to 1.6M for testing at various distances. Each page it's own contrast level at 100%, 2.5% and 1.25% . This flip book is the smaller version of the Cat. No. 2125. Cat. No. 2180 includes three levels of contrast sensitivity; Acuity, 2.5% and 1.25%. This contrast flip book is great for the use in clinical trials and research studies. It is printed on opaque, high-impact polystyrene and is washable. The test chart is also bound and includes instructions and recording forms. Each level uses traditional Sloan optotypes in an ETDRS format for an equally difficult test from beginning to end. Every level uses a different series of optotypes to help reduce any possibility of memorization. Also, each contrast sensitivity level is highly calibrated and will produce accurate results. This flip book is an excellent choice for research because of its accuracy and reliability.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921479557281,"sku":"2180","price":269.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/ccb4e23c8aa216f1e96d31ab209c036b_XL.jpg?v=1776157125"},{"product_id":"pv-numbers-25-michelson-contrast-chart-for-4-meter-testing","title":"PV Numbers 25% Michelson Contrast Chart for 4 Meter Testing","description":"\u003cp\u003eTwo groups for repetitive testing.\u003c\/p\u003e\n\u003cp\u003eCAT. NO. 2425 ETDRS Illuminator Cabinet is necessary with this chart.\u003c\/p\u003e\n\u003cp\u003eStudies and general practice has shown that regular contrast sensitivity testing can lead to the detection of early signs of many diseases. Some diseases include Glaucoma, Glare Problems, Parkinson's, and Cataracts. Also, by testing contrast vision during routine eye exams, more accurate and detailed records can be kept. Contrast vision changes throughout life and is different in each patient so accurate individual records are key to early detection of problems.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921482309793,"sku":"2728-opt","price":95.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/7af0193b8351bd1eb04c09dfe5731fa3_XL.jpg?v=1776157139"},{"product_id":"sloan-distance-high-contrast-acuity-folding-chart","title":"Sloan Distance High Contrast Acuity Folding Chart","description":"\u003cp\u003eTwo smaller groups 7.5M to 1.5M for repetitive testing (20\/50, 6\/15 to 20\/10, 6\/3 equiv.).\u003c\/p\u003e\n\u003cp\u003eCan be hand-held or there is a hole in the top to allow for wall mounting.\u003c\/p\u003e\n\u003cp\u003eThis folding chart is a combination of many highly calibrated and accurate vision tests. It incorporates traditional Sloan optotypes for testing. This helps to establish a constant and equal acuity object from beginning to end. Also, this test uses a ETDRS format to help maintain the idea of equality during testing. Also, this folding acuity chart features two smaller groups of optotypes for repetitive non memorized testing. This acuity test provides accurate and reliable results.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Original Version","offer_id":45921483161761,"sku":"2104__","price":50.6,"currency_code":"USD","in_stock":true},{"title":"Scrambled Version A","offer_id":45921483194529,"sku":"2104A__","price":50.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/0e17febd522cd9389b04ce5c00f25aec_XL-scaled-1.jpg?v=1776157145"},{"product_id":"low-contrast-visual-acuity-book","title":"Low Contrast Visual Acuity Book","description":"\u003cp\u003eContrast varies by page: full contrast, 25% , 10%, 5%, 2.5%, 1.25%, and .6%.\u003c\/p\u003e\n\u003cp\u003eSpiral bound.\u003c\/p\u003e\n\u003cp\u003eUses different optotype combinations for each level to prevent undesired memorization.\u003c\/p\u003e\n\u003cp\u003eThis contrast sensitivity flip book includes a series of seven contrast levels for accurate and precise vision testing. This levels decrease throughout the test beginning with acuity, 25%, 10%, 5%, 2.5%, 1.25% and ending with .6%. The use of several contrast levels help to accurately record the patients contrast sensitivity. Each test book includes instructions, recording forms and a soft tip pointer for accurate, easy and quick testing. All contrast levels are calibrated for testing and provide accurate, reliable, and repeatable results. Great for clinical studies or research.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Sloan","offer_id":45921483227297,"sku":"2125","price":345.0,"currency_code":"USD","in_stock":true},{"title":"PV Numbers","offer_id":45921483260065,"sku":"2725_","price":345.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/cef09c4dc3d0d8d265ab7ea9482b510d_XL.jpg?v=1776157146"},{"product_id":"mixed-contrast-chart","title":"Mixed Contrast Chart","description":"\u003cp\u003eThe Colenbrander Mixed contrast chart contains Black and 20% Weber (11% michelson) contrast.\u003c\/p\u003e","brand":"Colenbrander","offers":[{"title":"Default Title","offer_id":45921483686049,"sku":"4100","price":131.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/3a4499a4c30d6f082d254099c90f2c24_XL.jpg?v=1776157145"},{"product_id":"bailey-lovie-chart-set","title":"Bailey Lovie Chart Set","description":"\u003cp\u003eThe charts standardized the test task so that size is the only significant variable from one row to the next. There are 5 letters per row, between-letter and between-row spacings equal to letter size, size progresses by a constant ratio (0.1 log unit = 1,26x), and letter difficulties are balanced for each row. Contrast Sensitivity. The difference in the number of letters read on the high and low contrast charts provides a measure of the slope of the Contrast Sensitivity Function. The charts come as a set of two panels (21x24inches, 53x60cm) each with a high contrast chart one side and a low contrast chart (18% Weber or 10% Michelson) on the other. The optotype set is the family of ten British Standard (1968) 5x4 non-serifed letters. There are 14 rows with a range of sizes from 38 to 1.9 M-units. Sizes are given in Snellen units (in both feet and metric units), as well as visual acuity values in LogMAR and VAR (Visual Acuity Rating) for a 6 meter viewing distance. Any other viewing distance may be used as well. A scale printed on each chart provides the score adjustment for different test distances. With the LogMAR and VAR scales, equal credit is given for each additional letter read (each extra letter earns -0.02 with LogMAR , or 1 point with VAR)\u003c\/p\u003e\n\u003cp\u003eSee more from one of the developers, Dr. Ian Bailey in: \u003ca href=\"\/blogs\/videos\/behind-the-test-the-bailey-lovie-contrast-sensitivity-test\" target=\"_blank\" rel=\"noopener\"\u003eBehind the Test – The Bailey Lovie Contrast Sensitivity Test\u003c\/a\u003e\u003c\/p\u003e","brand":"Bailey-Lovie","offers":[{"title":"Default Title","offer_id":45921484046497,"sku":"5000 Bailey - Lovie","price":254.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/3946cc5a2ed843c2c9fca0b4efcd28ba_XL.jpg?v=1776157145"},{"product_id":"near-vision-card","title":"Near Vision Card","description":"\u003cp\u003eThe modified charts for “European-wide use” contain (Sloan) letters used in all European alphabets (Latin, Greek, Cyrillic), offering the advantage of containing letters recognizable by a wider population basis, such as European citizens, as well as subjects from countries using the Cyrillic alphabet At the same time, they remain faithful to the format thus ensuring adherence to the gold standards of visual acuity measurement.\u003c\/p\u003e\n\u003cdiv\u003eThe modified charts for “European-wide use” facilitate patient data exchange between doctors and clinics, securing validity of visual acuity screening among all EU population.\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003eMore specifically, the Sloan letters C, D, N, R, S, V, and Z in the revised ETDRS charts were substituted with E, P, X, B, T, M, and A, respectively. The new letters were constructed to the specifications of Sloan letters.\u003c\/div\u003e\n\u003cp\u003eThese charts are for measuring both near (33cm) and intermediate (66cm) visual acuity.  Mixed contrast with high contrast on side 1 and side 2 containing 20% Weber (10% Michelson) contrast levels.\u003c\/p\u003e\n\u003cp\u003eAttached cord assures accurate testing distances.  Chart measures 7\" x 9\".\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/wp-content\/uploads\/2015\/05\/a-modified-etdrs-visual-acuity-chart-for-european-wide-use.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eLearn more about the study\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Version 2","offer_id":45921485258913,"sku":"2841","price":65.0,"currency_code":"USD","in_stock":true},{"title":"Version 1","offer_id":45921485291681,"sku":"2831","price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/b5b56b2ae93d3dc958cf0c21c9383b18_XL-scaled-1.jpg?v=1776157159"},{"product_id":"sloan-double-sided-low-contrast-vision-card","title":"SLOAN Vision Card","description":"\u003cp\u003eFront side 2.5% contrast.\u003c\/p\u003e\n\u003cp\u003eBack side 10% contrast.\u003c\/p\u003e\n\u003cp\u003eNear Vision test uses both 2.5% and 10% contrast to test for contrast sensitivity. Test uses traditional Sloan optotypes in an ETDRS format. This helps in accurate vision testing and reliable results. Test is for use at 40 cm for near vision testing includes an accurate length cord to maintain viewing distances.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921485652129,"sku":"2117","price":96.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/16e33b8fd7ad7ca58b03c6bbca1f0b81_XL.jpg?v=1776157156"},{"product_id":"colenbrander-mixed-contrast-card","title":"Colenbrander Mixed Contrast Card","description":"\u003cp\u003eMixed Contrast Card designed by Dr. August Colenbrander M.D., Ph.D. with Reading Acuity On One Side, Letter Acuity on Other Side. Both sides calibrated for 40cm and include high contrast and low contrast (20% Weber\/ 10% Michelson) on the same chart face.\u003c\/p\u003e\n\u003cp\u003eThe print sizes follow the standard logarithmic sequence. Each line of text has the same number of characters. Basic reading assessment is important, since it may show the effect of para-central scotomata that do not yet interfere with central letter acuity. Each set comes with complete instructions, background, and recording sheet for scoring.\u003c\/p\u003e\n\u003cp\u003eReading Acuity Side In your choice of:\u003cbr\u003eENGLISH Part # 4071\u003cbr\u003eSPANISH Part # 4072\u003cbr\u003ePORTUGUESE Part # 4073\u003cbr\u003eGERMAN Part # 4074\u003cbr\u003eDUTCH Part # 4075\u003cbr\u003eFINNISH Part # 4076\u003cbr\u003eSWEDISH Part # 4077\u003cbr\u003eITALIAN Part # 4078\u003cbr\u003eFRENCH Part # 4079\u003cbr\u003eNORWEGIAN Part # 4070-19\u003cbr\u003eDANISH Part # 4080\u003cbr\u003eTAGALOG Part #4081\u003c\/p\u003e\n\u003cp\u003eThis is one card of a two card set. Each card is sold separately. \u003ca href=\"\/products\/intermediate-and-computer-acuity-chart\"\u003eThe other card in English is CAT NO. 4070\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e","brand":"Colenbrander","offers":[{"title":"Norwegian","offer_id":45921485783201,"sku":"4070-19","price":69.0,"currency_code":"USD","in_stock":true},{"title":"English","offer_id":45921485815969,"sku":"4071","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Spanish","offer_id":45921485848737,"sku":"4072","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Portuguese","offer_id":45921485881505,"sku":"4073","price":69.0,"currency_code":"USD","in_stock":true},{"title":"German","offer_id":45921485914273,"sku":"4074","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Dutch","offer_id":45921485947041,"sku":"4075","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Finnish","offer_id":45921485979809,"sku":"4076","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Swedish","offer_id":45921486012577,"sku":"4077","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Italian","offer_id":45921486045345,"sku":"4078","price":69.0,"currency_code":"USD","in_stock":true},{"title":"French","offer_id":45921486078113,"sku":"4079","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Danish","offer_id":45921486110881,"sku":"4080","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Tagalog","offer_id":45921486143649,"sku":"4081","price":69.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/8ab790b9074fed051af256aa504a66b7_XL.jpg?v=1776157174"},{"product_id":"continuous-text-near-vision-card-in-multiple-languages","title":"Continuous Text Near Vision Card - In Multiple Languages","description":"\u003cp\u003eDesign uses Continuous Text to simulate everyday tasks, such as reading the newspaper.\u003c\/p\u003e\n\u003cp\u003eAll 10% Low Contrast on both sides Wording may differ from picture.\u003c\/p\u003e\n\u003cp\u003eAlso Available in Spanish, Portuguese, German, Dutch , Finnish and Swedish.\u003c\/p\u003e\n\u003cp\u003eNear Point card uses a 10% contrast on both sides of the test. This tests for low contrast sensitivity while using a continuous text design. This design helps to simulate everyday situations, like reading the newspaper. Conventional, high-contrast letter chart acuity captures only one aspect of visual performance. Low contrast acuity is equally important for activities of daily living, since most everyday objects have less than black-on-white contrast, are larger than the smallest letters seen on a letter chart and are seen at various intermediate distances.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"English","offer_id":45921486176417,"sku":"4051","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Spanish","offer_id":45921486209185,"sku":"4052","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Portuguese","offer_id":45921486241953,"sku":"4053","price":90.0,"currency_code":"USD","in_stock":true},{"title":"German","offer_id":45921486274721,"sku":"4054","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Danish","offer_id":45921486307489,"sku":"4050-15","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Dutch","offer_id":45921486340257,"sku":"4055-Dutch","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Finnish","offer_id":45921486373025,"sku":"4056","price":90.0,"currency_code":"USD","in_stock":true},{"title":"Swedish","offer_id":45921486405793,"sku":"4057","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/7c8a032eb1fd580d4ed0e1065f1e3688_XL-scaled-1.jpg?v=1776157171"},{"product_id":"sloan-vision-chart","title":"SLOAN Vision Chart","description":"\u003cp\u003eFront and back sides are 10% low Contrast.\u003c\/p\u003e\n\u003cp\u003eDifferent optotype configurations on each side to reduce memorization.\u003c\/p\u003e\n\u003cp\u003eNear vision chart uses 10% calibrated contrast sensitivity levels on each side of the test. Also, chart uses two different configurations of optotypes to minimize memorization. This helps in more accurate vision test results. Near point chart also includes a cord to help control viewing distances for more precise testing.\u003c\/p\u003e\n\u003cp\u003eScrambled Version of this chart available for avoiding memorization during repeated testing. Order Item# 2118A.\u003c\/p\u003e\n\u003cp\u003eDownload Recording Forms for:   \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2022\/06\/0265d21d-2118-recording-form.pdf\"\u003e2118\u003c\/a\u003e - \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2022\/06\/7e8c1bab-2118a-recording-form.pdf\"\u003e2118A\u003c\/a\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Original Version","offer_id":45921486438561,"sku":"2118","price":96.0,"currency_code":"USD","in_stock":true},{"title":"Scrambled Version A","offer_id":45921486471329,"sku":"2118A","price":96.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/7dff099a65b026895942a872c251a542_XL.jpg?v=1776157159"},{"product_id":"rabin-contrast-sensitivity-cs-test","title":"Rabin Contrast Sensitivity Test","description":"\u003cp\u003eContrast sensitivity test comparable to the Small Letter Contrast Test.\u003c\/p\u003e\n\u003cp\u003eDetects subtle effects of defocus, low luminance and glare.\u003c\/p\u003e\n\u003cp\u003eLog CS increases 0.25 steps per row (0.05 log CS\/letter).\u003c\/p\u003e\n\u003cp\u003eAvailable with glare filter CAT. NO. 2147 and low photopic filter CAT. NO. 2148.\u003c\/p\u003e\n\u003cp\u003eAlso available: The Complete Rabin set (CAT. NO. 2120) includes (CAT. NO. 2126) Rabin contrast sensitivity test, (CAT. NO. 2147) Glare Filter, (CAT. NO. 2148) low photopic filter, (CAT. NO. 914) Illuminator cabinet, and (CAT. NO. 915) 5 leg base for $450.00.\u003c\/p\u003e\n\u003cp\u003eEach line on the Rabin Contrast Sensitivity Test is a lower contrast than the one before it, using Log CS steps. This progression in contrasts helps to identify the patient's contrast sensitivity. Furthermore, the test helps to detect subtle effects such as defocus and low luminance and glare.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921486504097,"sku":"2126","price":207.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/6e6b736f77dd07b0a373e582bb4b1e3c_XL-scaled-1.jpg?v=1776157156"},{"product_id":"rabin-contrast-sensitivity-test-2","title":"Rabin Contrast Sensitivity Test","description":"\u003cp\u003eDetects subtle effects of defocus, low luminance and glare.\u003c\/p\u003e\n\u003cp\u003eLog CS increases 0.25 steps per row (0.05 Log CS per Letter).\u003c\/p\u003e\n\u003cp\u003eMust be used with Cat. No. 2425 Large ETDRS Illuminator Cabinet.\u003c\/p\u003e\n\u003cp\u003eRabin Contrast Sensitivity Test uses several different levels of contrast to find the patient's true sensitivity. The line progression helps to detect early signs such as defocus, glare and low luminance problems. Because of the precision of each contrast level, the large Illuminator Cabinet (2425) must be used. Without the use of the cabinet, the contrast levels will not be accurate.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921486536865,"sku":"2127","price":230.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/b190b9bcae39ee6b68c160e3e6f45456_XL.jpg?v=1776157156"},{"product_id":"complete-rabin-contrast-sensitivity-set","title":"Complete Rabin Contrast Sensitivity Set","description":"\u003cp\u003eA new contrast sensitivity test comparable to the small letter contrast test.\u003c\/p\u003e\n\u003cp\u003eDetects subtle effects of defocus, low luminance and glare.\u003c\/p\u003e\n\u003cp\u003eLog CS increases 0.25 steps per row (0.05 log CS\/ letter).\u003c\/p\u003e\n\u003cp\u003eTest Includes CAT. NO. 2126 Rabin Contrast Sensitivity Test CAT. NO. 937 Glare Filter CAT. NO. 931 Low Photopic Filter CAT. NO. 914 Small Illuminator Cabinet CAT. NO. 915 Adjustable Base.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Standard","offer_id":45921486602401,"sku":"2120","price":517.5,"currency_code":"USD","in_stock":true},{"title":"LED","offer_id":45921486635169,"sku":"2120-LED","price":586.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/d3787968271aadf66b69e2f7e02571e2_L.jpg?v=1776157159"},{"product_id":"pelli-robson-contrast-sensitivity-chart","title":"Pelli-Robson Contrast Sensitivity Chart","description":"\u003cp\u003eFeatures Traditional Sloan Optotypes\u003c\/p\u003e\n\u003cp\u003eFor use at 100cm (1m)\u003c\/p\u003e\n\u003cp\u003eIncludes two charts which may be wall or easel mounted and score sheets.\u003c\/p\u003e\n\u003cp\u003eIllumination of 85 cd\/m² is key to good results\u003c\/p\u003e\n\u003cp\u003eDesigned by DG Pelli, JG Robson and A J Wilkins, because they see contrast sensitivity as a realistic assessment of how well the patient sees large faint objects.\u003c\/p\u003e\n\u003cp\u003eThe chart follows the luminance, font, and letter spacing recommendations of the Committee on Vision of the National Academy of Sciences and National Research Council (Adv. Ophthal 41, 103-148, 1980).\u003c\/p\u003e\n\u003cp\u003eThe letter sequences are organized into groups of three (triplets) with two triplets per line. Within each triplet, all letters have the same contrast. The contrast decreases from one triplet to the next, even within one line.\u003c\/p\u003e\n\u003cp\u003eThe testing of contrast sensitivity on a regular basis is key to detecting early signs of diseases such as Parkinson's, Glaucoma, and Cataracts. By testing with several different contrast levels configured together, the patient's contrast sensitivity level is better assessed and records will be more precise.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/products\/easel-for-pelli-robson-charts\/\"\u003eEasel Available\u003c\/a\u003e For Display alternative to wall mounting.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/10\/b2f0f8ad-pelli-robson-instructions.pdf\"\u003eDownload Instructions\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eDownload Recording Forms for:  \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/10\/e7eccad9-5014-chart-1-and-2-recording-form.pdf\"\u003e5014\u003c\/a\u003e  -  \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/10\/d9396917-5014-3-recording-form-rev2.pdf\"\u003e5014-3\u003c\/a\u003e  - \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/10\/c90c0ad9-5014-4-recording-form-rev2-approved.pdf\"\u003e5014-4\u003c\/a\u003e\u003c\/p\u003e","brand":"Pelli-Robson","offers":[{"title":"Set 1","offer_id":45921486766241,"sku":"5014","price":598.75,"currency_code":"USD","in_stock":true},{"title":"Chart 1","offer_id":45921486799009,"sku":"5014-1","price":327.25,"currency_code":"USD","in_stock":true},{"title":"Chart 2","offer_id":45921486831777,"sku":"5014-2","price":327.25,"currency_code":"USD","in_stock":true},{"title":"Chart 3","offer_id":45921486864545,"sku":"5014-3","price":327.25,"currency_code":"USD","in_stock":true},{"title":"Chart 4","offer_id":45921486897313,"sku":"5014-4","price":327.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/5014_1-scaled-1.jpg?v=1776157164"},{"product_id":"rabin-super-vision-test","title":"Rabin Super Vision Test","description":"\u003cp\u003eDeveloped by Jeff Rabin, OD, PhD,US Air Force School of Aerospace Medicine.\u003c\/p\u003e\n\u003cp\u003eSuper vision test is designed for use at 4 meters (13 feet, 1.5 inches).\u003c\/p\u003e\n\u003cp\u003eNotations are printed on the chart in LogMAR 0.2 to -0.6 on the top half of the chart.\u003c\/p\u003e\n\u003cp\u003eOn the bottom half notations are printed in LogCS with a letter size of 5M, 4\/5, 13\/16.5 (6\/7.5, 20\/25 equiv.).\u003c\/p\u003e\n\u003cp\u003eHigh contrast VA (20\/32 to 20\/5 log MAR scale; 20\/5 is 4x smaller than 20\/20).\u003c\/p\u003e\n\u003cp\u003eUsed by branches of the US Armed Forces.\u003c\/p\u003e\n\u003cp\u003eThis Super Vision test includes visual acuity and letter contrast sensitivity (CS) on a single chart. The top portion of the chart tests for acuity vision while the bottom half includes highly calibrated levels of contrast. Chart includes eight separate contrast levels for the most precise contrast sensitivity test. This eye chart also includes a separate optotype sequence for each eye to reduce memorization possibilities. This test is designed for use with the Small 914 Illuminator Cabinet.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2020\/05\/BEYOND-2020-MM-FECO.pdf\"\u003eRead More from Military Medicine:  Beyond 20\/20: New Clinical Methods to\u003c\/a\u003e\u003cbr\u003e\n\u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2020\/05\/BEYOND-2020-MM-FECO.pdf\"\u003eQuantify Vision Performance\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2020\/05\/SVT-SCORE-SHEET.pdf\"\u003eScore Sheet Available\u003c\/a\u003e\u003c\/p\u003e","brand":"Rabin","offers":[{"title":"Default Title","offer_id":45921486930081,"sku":"2128","price":207.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/2d6c15d654bd7f03d72e8900a9ebd07f_XL-scaled-1.jpg?v=1776157158"},{"product_id":"easel-for-pelli-robson-charts","title":"Easel for Pelli Robson Charts","description":"","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921487061153,"sku":"Easel5014","price":135.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/5159b236-new-easel-scaled-1.jpg?v=1776157160"},{"product_id":"peek-a-boo-patti-low-contrast-test","title":"Peek-a-Boo Patti Contrast Test","description":"\u003cp\u003eThis test set consists of four oval cards which are printed on both sides with contrast levels of 1.25%, 2.5%, 5%, 10%, 25% and full contrast.\u003c\/p\u003e\n\u003cp\u003eOne card is left blank for presentation.\u003c\/p\u003e\n\u003cp\u003eLaminated, making them Durable and washable!\u003c\/p\u003e\n\u003cp\u003eThese cards rely on the idea that children and infants respond better to faces than to random symbols or shapes. These cards use the adorable face of the Patti Pics logo to hold the attention of children. Each card is the same size and shape and is printed in six different contrast levels. With the use of the blank presentation card, testing is quick and easy. The child should respond to each contrast level they see. Peek-a-Boo Patti cards are great for testing infants and those with mental disabilities. Great for clinical testing.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921487126689,"sku":"2535","price":178.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/29fbfe7f-2535-web-image-scaled-1.jpg?v=1776157159"},{"product_id":"mars-contrast-sensitivity-test","title":"Mars Contrast Sensitivity Test - Numbers","description":"\u003cp\u003e\u003cstrong\u003eUses\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEstablishing baseline contrast sensitivity before and after an intervention(such as cataract extraction, LASIK, or other refractive surgery)\u003c\/li\u003e\n\u003cli\u003eIdentifying functional losses in low contrast perception (often associated with glare sensitivity)\u003c\/li\u003e\n\u003cli\u003eMonitoring effects of disease progression on function\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures and Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThree charts, for the left eye, right eye, and binocular testing, or for repeated testing without letter sequence memorization\u003c\/li\u003e\n\u003cli\u003eRapid administration, with easy, accurate scoring\u003c\/li\u003e\n\u003cli\u003eEasy to store and protect\u003c\/li\u003e\n\u003cli\u003eEasy to illuminate (e.g., with instrument stand lamp)\u003c\/li\u003e\n\u003cli\u003eEach chart is mounted on durable plastic\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MARS","offers":[{"title":"Numbers","offer_id":45921487257761,"sku":"5019","price":435.0,"currency_code":"USD","in_stock":true},{"title":"Letters","offer_id":45921487290529,"sku":"5015","price":435.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/d29f724a45ead59fbed342a9b3ad72f4_XL.jpg?v=1776157162"},{"product_id":"sloan-distance-high-contrast-fold-eye-chart","title":"SLOAN Distance High Contrast Fold Eye Chart","description":"\u003cp\u003eTwo smaller groups 7.5M to 1.5M for repetitive testing (20\/50, 6\/15 to 20\/10, 6\/3 equiv.).\u003c\/p\u003e\n\u003cp\u003eCan be hand-held or there is a hole in the top to allow for wall mounting.\u003c\/p\u003e\n\u003cp\u003eThis folding chart is a combination of many highly calibrated and accurate vision tests. It incorporates traditional Sloan optotypes for testing. This helps to establish a constant and equal acuity object from beginning to end. Also, this test uses a ETDRS® format to help maintain the idea of equality during testing. Also, this folding acuity chart features two smaller groups of optotypes for repetitive non memorized testing. This acuity test provides accurate and reliable results.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921488371873,"sku":"2104US","price":60.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/dc7259495409db483f53803df58f17e8_XL-scaled-1.jpg?v=1776157160"},{"product_id":"sloan-low-contrast-for-2425-with-islands","title":"SLOAN Chart","description":"\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eContrast Sensitivity plays an intricate part in everyday life. Testing contrast sensitivity helps to establish a record of what is normal for each patient, since everyone’s contrast sensitivity is unique. After establishing this accurate record for the patient, pinpointing abnormalities will be easier and can lead to quicker detection of vision problems. Abnormal contrast sensitivity results can help detect early signs of diseases such as Parkinson’s, Glaucoma, Cataracts and Glare problems, among many others. \u003cbr\u003eSloan low contrast vision test features equivalents on each side of the chart. These equivalents include Meters, Feet, LogMar, and Decimal. This list helps in easy translation and conversion of equivalents. Coupled with Sloan letters, true contrast levels and ETDRS style format, this contrast sensitivity test is accurate and reliable.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eETDRS Illuminator Cabinets are necessary with these translucent low contrast charts.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eLow lighting often causes problems with patients that suffer from contrast sensitivity loss. In dimmed or low lighting, patients may not be able to make out furniture, read, or walk without running into items. Also, because patients with low contrast sensitivity may not be able to see other cars or pedestrians, driving at night would be very difficult. These symptoms point to an underlying problem with a patient’s vision and can be early signs of many types of diseases.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921488404641,"sku":"2181","price":98.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/4f411c7dd400d8cc3ebd00031ff0e07d_XL.jpg?v=1776157160"},{"product_id":"pelli-robson-contrast-sensitivity-test-for-near-distance","title":"Pelli Robson Contrast Sensitivity Test for Near Distance","description":"\u003cp\u003eFeatures Traditional Sloan Optotypes found in the Original Pelli Robson Chart!\u003c\/p\u003e\n\u003cp\u003eFor use at 16 in (40cm) Includes three charts, each of which is scrambled to avoid memorization.  The three charts may also be administered utilizing right eye, left eye, and both eyes.\u003c\/p\u003e\n\u003cp\u003eHandy and durable case included for storage.\u003c\/p\u003e","brand":"Pelli-Robson","offers":[{"title":"Sloan","offer_id":45921488896161,"sku":"5013","price":349.0,"currency_code":"USD","in_stock":true},{"title":"Patti Pics","offer_id":45921488928929,"sku":"5011","price":349.0,"currency_code":"USD","in_stock":true},{"title":"PV Numbers","offer_id":45921488961697,"sku":"5012","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/5013_Image_JK.jpg?v=1776157166"},{"product_id":"patti-pics-chart","title":"Patti Pics™ Chart","description":"\u003cp\u003eTwo smaller groups 3.8M to 1.2M for repetitive testing (20\/25, 6\/7.5 to 20\/8, 6\/2.4 equiv.).\u003c\/p\u003e\n\u003cp\u003eIncludes Logarithmic increments.\u003c\/p\u003e\n\u003cp\u003ePatti Pics symbols are useful for testing young children and non-verbal patients. The five symbols that make up the test are easily recognizable and with the use of the response key, recording contrast sensitivity is easy. Testing contrast sensitivity in children helps to identify early signs of developmental delays. The sooner delays and contrast sensitivity problems are noticed the sooner a diagnosis can be achieved and treatments started.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"1.25%","offer_id":45921496203425,"sku":"2537","price":51.75,"currency_code":"USD","in_stock":true},{"title":"2.5%","offer_id":45921496236193,"sku":"2538","price":51.75,"currency_code":"USD","in_stock":true},{"title":"5%","offer_id":45921496268961,"sku":"2539","price":51.75,"currency_code":"USD","in_stock":true},{"title":"10%","offer_id":45921496301729,"sku":"2540","price":51.75,"currency_code":"USD","in_stock":true},{"title":"25%","offer_id":45921496334497,"sku":"2541","price":51.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/3bc7aa7f337d2b6d218588b9fca9e94f_XL-scaled-1.jpg?v=1776157183"},{"product_id":"pv-numbers-translucent-chart","title":"PV Numbers Translucent Chart","description":"\u003cp\u003eContrast Sensitivity testing is a great tool for clinical exams. By testing contrast vision on a routine basis, early signs of diseases are more noticeable and records are more accurate. Contrast vision is incredibly important on an everyday basis and should be tested regularly, like acuity.\u003c\/p\u003e\n\u003cp\u003ePV Number charts are acceptable for testing pediatrics as well. Children 4-5 years old can be tested using a number chart and still achieve accurate results. By the time the child is 4 to 5 years old, they can, often times, understand and recognize numbers, even if they do not yet know their alphabet.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"1.25%","offer_id":45921496367265,"sku":"2715","price":53.5,"currency_code":"USD","in_stock":true},{"title":"2.5%","offer_id":45921496400033,"sku":"2716","price":53.5,"currency_code":"USD","in_stock":true},{"title":"5%","offer_id":45921496432801,"sku":"2717","price":53.5,"currency_code":"USD","in_stock":true},{"title":"10%","offer_id":45921496465569,"sku":"2718","price":53.5,"currency_code":"USD","in_stock":true},{"title":"25%","offer_id":45921496498337,"sku":"2719","price":53.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/4251dec72b18ac89643edfb7a8300016_XL-scaled-1.jpg?v=1776157184"},{"product_id":"sloan-letters-chart","title":"SLOAN Letters Chart","description":"\u003cp\u003eTwo smaller groups 5M to 2M for repetitive testing (20\/40, 6\/12 to 20\/10, 6\/3 equiv.).\u003c\/p\u003e\n\u003cp\u003eSmall Illuminator Cabinet\u003cspan\u003e \u003c\/span\u003eis necessary for these low contrast charts.\u003c\/p\u003e\n\u003cp\u003eHelps detect early signs of vision loss from forming cataracts.\u003c\/p\u003e\n\u003cp\u003eExtremely useful in clinical testing.\u003c\/p\u003e\n\u003cp\u003eContrast Sensitivity tests are extremely calibrated tests. By using Sloan letters based off of a 5×5 grid, along with highly calibrated contrast levels, patients are tested with a highly reliable tool. Contrast Sensitivity tests also depend on the proper retro illumination. Such illumination can be obtained through a small illuminator cabinet and is highly recommended. Many times using ambient lighting will change the contrast level, thereby creating a different test. Proper testing will lead to more reliable results and a more accurate diagnosis.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"\/products\/special-4-meter-sloan-letters-translucent-contrast-chart-for-914-cabinet\/\"\u003eCan’t find the version you need?\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"2 m \/ 6.5 ft \/ 10%","offer_id":45921496531105,"sku":"2132-2","price":53.5,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 1.25%","offer_id":45921496563873,"sku":"2129","price":53.5,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 25%","offer_id":45921496596641,"sku":"2133","price":53.5,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 10%","offer_id":45921496629409,"sku":"2132","price":53.5,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 5%","offer_id":45921496662177,"sku":"2131","price":53.5,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 2.5%","offer_id":45921496694945,"sku":"2130","price":53.5,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 1.25%","offer_id":45921496727713,"sku":"2184","price":53.5,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 2.5%","offer_id":45921496760481,"sku":"2185","price":64.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 5%","offer_id":45921496793249,"sku":"2186","price":64.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 10%","offer_id":45921496826017,"sku":"2187","price":53.5,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 25%","offer_id":45921496858785,"sku":"2188","price":53.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/LowContrastsloanvisonlosstool.jpg?v=1776157190"},{"product_id":"tumbling-e-translucent-chart","title":"Tumbling \"E\" Translucent Chart","description":"\u003cp\u003eBy using only one optotype, the E, this vision test has multiple and unique uses that other vision tests may not be able to achieve. The Tumbling E vision tests provide a way to test patients that are not familiar with the Roman alphabet. Patients simply have to gesture the direction that they see the E facing. The Tumbling E test is also helpful for patients that are mute or illiterate.\u003c\/p\u003e\n\u003cp\u003eDownload Recording Forms for : \u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2022\/06\/d47b9dfd-2321-recording-form.pdf\"\u003e2321\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan't find the distance you need? \u003ca href=\"\/pages\/contact\"\u003eContact Us\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"1.25%","offer_id":45921496891553,"sku":"2321","price":98.25,"currency_code":"USD","in_stock":true},{"title":"2.5%","offer_id":45921496924321,"sku":"2320","price":98.25,"currency_code":"USD","in_stock":true},{"title":"5%","offer_id":45921496957089,"sku":"2319","price":98.25,"currency_code":"USD","in_stock":true},{"title":"10%","offer_id":45921496989857,"sku":"2318","price":98.25,"currency_code":"USD","in_stock":true},{"title":"25%","offer_id":45921497022625,"sku":"2317","price":98.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/4653e069ed7369840191e8bf38ab8dc9_XL.jpg?v=1776157186"},{"product_id":"sloan-revised-low-contrast-chart","title":"Sloan Revised Low-Contrast Chart for Large Illuminator Cabinet","description":"\u003cp\u003eSloan Revised Low-Contrast translucent chart, designed to fit the 2425 and 2425 LED Large ETDRS® Illuminator Cabinets. 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Previous to SpotChecks™, commercially available CS tests were expensive, not easily portable or require supervised testing conditions.\u003c\/p\u003e\n\u003cp\u003eSpotChecks™ \u003cspan style=\"font-weight: 400;\"\u003e(an improved version of CamBlobs™) \u003c\/span\u003e changes everything about gathering precise contrast sensitivity testing results.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEach test is a single use test where patients test themselves by marking an “x” on each contrast target they see. Testing is intuitive; it only takes 2-3 minutes to complete the test and scoring the results is very easy and takes only a minute. The test sheet itself then becomes the record for the patient file.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn normal subjects, the score range and reproducibility of the SpotChecks™ \u003cspan style=\"font-weight: 400;\"\u003e(formally known as CamBlobs™) \u003c\/span\u003echart agrees remarkably well with those of Pelli-Robson (PR) CS chart, the reference standard in research and clinical trials for many years.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cem\u003e\u003cspan style=\"font-weight: 400;\"\u003eQuick. Easy. Accurate. Repeatable. 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There is a need to have surveillance in high-risk patients. A home used device to monitor retinal detachment is helpful as Ocular emergency cases are quite common with floaters, flashes of light, with or without peripheral vision or central vision decrease, however The Zhang Ring Test™ provides an easy to use screening test in emergency medicine, urgent care, patient home and other settings in this regard. Each SKU 9103 consists of a Pad of 50 tests with instructions printed directly on the test.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003e“I showed this product in the Cutting Edge Symposium at the 2018 annual meeting of the American Academy of Ophthalmology. It was included because ophthalmologists give Amsler Grids to patients with macular disease for home testing, so it makes sense to offer the Zhang Ring Test to patients with increased risk for retinal detachment.”- Robert H. Osher, M.D\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921502494881,"sku":"9103","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/c5efcffe-pv_zhang_watermark_donotprint-scaled-1.jpg?v=1776157201"},{"product_id":"flip-book","title":"Flip Book","description":"\u003cp\u003eMulti-distance testing.\u003c\/p\u003e\n\u003cp\u003eContains five pages of optotypes of 9.5M.\u003c\/p\u003e\n\u003cp\u003eContrast varies by page: 25%, 10%, 5%, 2.5%, and 1.2%.\u003c\/p\u003e\n\u003cp\u003eHOTV optotypes are great for testing pediatrics and illiterate adults. The use of only four easily recognizable optotypes makes it so even children that are preliterate can be easily taught the letters and can respond with the use of the response key and flash cards. 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Proper testing will lead to more reliable results and a more accurate diagnosis.\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"2.5% \/ Scrambled Version A","offer_id":45921503740065,"sku":"2184A","price":53.5,"currency_code":"USD","in_stock":true},{"title":"2.5% \/ Scrambled Version B","offer_id":45921503871137,"sku":"2185 CUSTOM","price":53.5,"currency_code":"USD","in_stock":true},{"title":"2.5% \/ Scrambled Version C","offer_id":45972225196193,"sku":null,"price":53.5,"currency_code":"USD","in_stock":true},{"title":"10% \/ Scrambled Version A","offer_id":45921503772833,"sku":"2187A","price":53.5,"currency_code":"USD","in_stock":true},{"title":"10% \/ Scrambled Version B","offer_id":45921503805601,"sku":"2185 CUSTOM","price":51.75,"currency_code":"USD","in_stock":true},{"title":"10% \/ Scrambled Version C","offer_id":45972225228961,"sku":null,"price":53.5,"currency_code":"USD","in_stock":true},{"title":"25% \/ Scrambled Version A","offer_id":45921503936673,"sku":"2188A","price":53.5,"currency_code":"USD","in_stock":true},{"title":"25% \/ Scrambled Version B","offer_id":45921503969441,"sku":"2188B","price":53.5,"currency_code":"USD","in_stock":true},{"title":"25% \/ Scrambled Version C","offer_id":45972225261729,"sku":null,"price":53.5,"currency_code":"USD","in_stock":true},{"title":"5% \/ Scrambled Version A","offer_id":45921504034977,"sku":"2186A","price":64.25,"currency_code":"USD","in_stock":true},{"title":"5% \/ Scrambled Version B","offer_id":45921504067745,"sku":"2186B","price":53.5,"currency_code":"USD","in_stock":true},{"title":"5% \/ Scrambled Version C","offer_id":45972225294497,"sku":"2186C","price":53.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/LowContrastsloanvisonlosstool_cd3e0231-ee0b-4362-8881-6928dba21d76.jpg?v=1776157212"},{"product_id":"patti-pics-translucent-chart","title":"Patti Pics™ Translucent Chart","description":"\u003cp\u003eTwo smaller groups 3.8M to 1.2M for repetitive testing (20\/25, 6\/7.5 to 20\/8, 6\/2.4 equiv.).\u003c\/p\u003e\n\u003cp\u003eIncludes Logarithmic increments.\u003c\/p\u003e\n\u003cp\u003ePatti Pics symbols are useful for testing young children and non-verbal patients. The five symbols that make up the test are easily recognizable and with the use of the response key, recording contrast sensitivity is easy. Testing contrast sensitivity in children helps to identify early signs of developmental delays. The sooner delays and contrast sensitivity problems are noticed the sooner a diagnosis can be achieved and treatments started.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan't find the chart you need? \u003ca href=\"\/pages\/contact\"\u003eContact Us\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"2.5 m \/ 8.3 ft \/ 1.25%","offer_id":45921504133281,"sku":"2570","price":98.25,"currency_code":"USD","in_stock":true},{"title":"2.5 m \/ 8.3 ft \/ 2.5%","offer_id":45921504166049,"sku":"2571","price":98.25,"currency_code":"USD","in_stock":true},{"title":"2.5 m \/ 8.3 ft \/ 5%","offer_id":45921504198817,"sku":"2572","price":98.25,"currency_code":"USD","in_stock":true},{"title":"2.5 m \/ 8.3 ft \/ 10%","offer_id":45921504231585,"sku":"2573","price":98.25,"currency_code":"USD","in_stock":true},{"title":"2.5 m \/ 8.3 ft \/ 25%","offer_id":45921504264353,"sku":"2574","price":98.25,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 1.25%","offer_id":45921504297121,"sku":"2565","price":98.25,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 2.5%","offer_id":45921504329889,"sku":"2566","price":98.25,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 5%","offer_id":45921504362657,"sku":"2567","price":98.25,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 10%","offer_id":45921504395425,"sku":"2568","price":98.25,"currency_code":"USD","in_stock":true},{"title":"3 m \/ 10 ft \/ 25%","offer_id":45921504428193,"sku":"2569","price":98.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 1.25%","offer_id":45921504460961,"sku":"2560","price":98.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 2.5%","offer_id":45921504493729,"sku":"2561","price":98.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 5%","offer_id":45921504526497,"sku":"2562","price":98.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 10%","offer_id":45921504559265,"sku":"2563","price":98.25,"currency_code":"USD","in_stock":true},{"title":"4 m \/ 13 ft \/ 25%","offer_id":45921504592033,"sku":"2564","price":98.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/8376aace7af18ea8cafa499d7e69a6ec_XL.jpg?v=1776157215"},{"product_id":"trans-illuminated-pelli-robson-near-chart-3","title":"Trans-Illuminated Near Pelli-Robson - Chart 3","description":"\u003cp\u003eThe Trans-Illuminated Pelli-Robson Contrast Sensitivity Chart #3 is to be utilized in either the \u003ca href=\"\/products\/small-illuminator-cabinet?variant=18366\/\"\u003e914\u003c\/a\u003e or \u003ca href=\"\/products\/small-led-illuminator-cabinet\/\"\u003e930\u003c\/a\u003e Precision Vision Small Illuminator Cabinet.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Pelli-Robson","offers":[{"title":"Default Title","offer_id":45921504624801,"sku":"5013-Trans","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/pv-3-1200x1200__1555006294_71.57.61.181.jpg?v=1776157205"},{"product_id":"intermediate-and-computer-acuity-chart","title":"Intermediate and Computer Acuity Chart","description":"\u003cp\u003eColenbrander Mixed Contrast Card for Computer Distance 63cm (Front) and Intermediate Distance 100cm (Back). Choice of Letters or Numbers\/Tumbling E’s on Front \u0026amp; Back – One Chart.\u003c\/p\u003e\n\u003cp\u003eUses 10% calibrated Contrast Sensitivity level with Acuity.\u003c\/p\u003e\n\u003cp\u003eDesigned by Dr. August Colenbrander.\u003c\/p\u003e\n\u003cp\u003eConventional, high-contrast letter chart acuity captures only one aspect of visual performance. Low contrast acuity is equally important for activities of daily living, since most everyday objects have less than black-on-white contrast, are larger than the smallest letters seen on a letter chart and are seen at various intermediate distances.\u003c\/p\u003e\n\u003cp\u003eAll tests provide HC targets on the left and LC targets (10% contrast) on the right. The left-hand margin indicates the letter size in M-units. Calibrated for use at 63 cm (25\u003c\/p\u003e","brand":"Colenbrander","offers":[{"title":"Letters","offer_id":45921508524193,"sku":"4070","price":69.0,"currency_code":"USD","in_stock":true},{"title":"Numbers\/Tumbling E’s","offer_id":45921508556961,"sku":"4070EN","price":69.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/9f9f79e544fb8eb705d18df3c18b9f0a_XL.jpg?v=1776157224"},{"product_id":"low-vision-standard-contrast","title":"Low Vision, Standard Contrast","description":"\u003ch1 class=\"product_title entry-title\"\u003eMixed Contrast Reading Card – In Multiple Languages\u003c\/h1\u003e\n\u003cp\u003eDesigned as a simple screen test. The usual question for a reading test is: What is the smallest (black) line you can read? On the contrast card one adds the question What is the smallest (grey) line you can read? The difference between the two measurements will be obvious and can simply be expressed in lines. Preliminary findings indicate a 2 or 3 line difference is normal.\u003c\/p\u003e\n\u003cp\u003eUnrelated simple sentences at 4th grade level.\u003c\/p\u003e\n\u003cp\u003eServes as an educational tool to demonstrate the effect of contrast deficits to patients and family members.\u003c\/p\u003e\n\u003cp\u003eAlso Available in Spanish, Portuguese, German, Dutch , Finnish , Swedish , Italian, French, and Danish.\u003c\/p\u003e\n\u003ch1 class=\"product_title entry-title\"\u003eContinuous Text Mixed Contrast Near Vision Card – In Multiple Languages\u003c\/h1\u003e\n\u003cp\u003eNot time consuming (avg. read time: 45 sec.).\u003c\/p\u003e\n\u003cp\u003eUnrelated simple sentences at 4th grade level.\u003c\/p\u003e\n\u003cp\u003eServes as an educational toll to demonstrate the effect on contrast deficits to patients and family members.\u003c\/p\u003e\n\u003cp\u003eNear vision test features the mixture of acuity testing and 10% contrast sensitivity testing in one chart. Patients are tested for each simultaneously in a continuous text format. This format uses simple calibrated sentences which make testing easy and quick. This near point continuous text chart is also available in multiple languages including: English, Spanish, German, French, Portuguese, Finnish, Swedish, Italian, and Greek.\u003c\/p\u003e\n\u003ch1 class=\"product_title entry-title\"\u003eContinuous Text Near Vision Card – In Multiple Languages\u003c\/h1\u003e\n\u003cp\u003eNotations for commonly recommended testing standard of 40 cm (16 in.).\u003c\/p\u003e\n\u003cp\u003eEnglish reading card with sentences of equal length and difficulty.\u003c\/p\u003e\n\u003cp\u003eLetter sizes from 6.3M to .32M in Times Roman Font.\u003c\/p\u003e\n\u003cp\u003eAlso Available in Spanish, Portuguese, German, Dutch , Finnish , Swedish , Italian , French, and Greek.\u003c\/p\u003e\n\u003cp\u003eContinuous text cards simulate everyday tasks and activities that patients may encounter, such as reading the newspaper. This is important because it is the main part of everyday vision. Also, by testing with continuous text, doctors can establish a basis for prescriptions of magnification for corrective lenses. If everyday vision tasks are made easier, in turn the patient’s life can be easier.\u003c\/p\u003e\n\u003ch1 class=\"product_title entry-title\"\u003eLow Vision Reading Card – In Multiple Languages\u003c\/h1\u003e\n\u003cp\u003eLAYOUT\u003cbr\u003e\nThe card contains proportionally spaced reading segments in LogMAR on two sides. Side one increments ranging in size from 10m to 3m in Times Roman font. Side two features two charts From 4m to 0.6m, two sets are provided to avoid memorization. Each line contains the same number of letters and spaces. A diopter ruler is included.\u003c\/p\u003e\n\u003cp\u003eREADING ACUITY\u003cbr\u003e\nAny patient who can read even one segment at any distance deserves a low vision evaluation.\u003c\/p\u003e\n\u003cp\u003eUse of the diopter ruler allows a quick check of the reading distance against the reading add. It also allows verifying the reading acuity, using the modified Snellen formula: 1\/V = M x D (M = letter size in M-units, D = viewing distand in diopters.) Examples: at 40 cm (2.5D) the 10m text represents 1\/25 (20\/500, 0.04), since 10m x 2.5D = 25. At 20cm (5D) 10m represents 1\/50 (20\/1000, 0.02), since 10m x 5D = 50. At 40cm (2.5D) the smalles print (0.06) represents 1\/16 (20\/32, 0.32), since 0.6m x 2.5D = 1.6.\u003c\/p\u003e\n\u003cp\u003eREADING FLUENCY\u003cbr\u003e\nSince all lines have the same length, reading performance can be times to determine the level of magnification that will give optimum performance.\u003c\/p\u003e\n\u003cp\u003e----------\u003c\/p\u003e","brand":"Colenbrander","offers":[{"title":"Danish","offer_id":45921509867681,"sku":"4060-15","price":90.0,"currency_code":"USD","in_stock":true},{"title":"English","offer_id":45921509900449,"sku":"4011","price":55.25,"currency_code":"USD","in_stock":true},{"title":"Spanish","offer_id":45921509933217,"sku":"4012","price":55.25,"currency_code":"USD","in_stock":true},{"title":"Portuguese","offer_id":45921509965985,"sku":"4013","price":55.0,"currency_code":"USD","in_stock":true},{"title":"German","offer_id":45921509998753,"sku":"4014","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Dutch","offer_id":45921510031521,"sku":"4015","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Finnish","offer_id":45921510064289,"sku":"4016","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Swedish","offer_id":45921510097057,"sku":"4017","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Italian","offer_id":45921510129825,"sku":"4018","price":55.0,"currency_code":"USD","in_stock":true},{"title":"French","offer_id":45921510162593,"sku":"4019","price":55.0,"currency_code":"USD","in_stock":true},{"title":"Greek","offer_id":45921510195361,"sku":"4016-15","price":74.75,"currency_code":"USD","in_stock":true},{"title":"Norwegian","offer_id":45921510228129,"sku":"4010-19","price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/d5df152e20908e75d0017d93f2a154f3_XL-scaled-1_e6e74778-58b6-4998-a694-78c67c2c1c9b.jpg?v=1776157248"},{"product_id":"sloan-pocket-size-card","title":"SLOAN Pocket Size Card","description":"\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eIncludes Pupil Gauge and Rulers.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eFront \u0026amp; Back sides are printed in 10% Michelson Contrast\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eFeatures traditional Sloan optotypes that follow a ETDRS 2000 Series format including a combination of Charts 1 and 2. Near Point card uses Logarithmic acuity and includes distance equivalents in both meters and feet.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003ePocket Test is useful to quickly screen for near vision deficiencies in any situation. Card features traditional Sloan optotypes on the front and a Continuous Text chart on the back. This Continuous Text test is great for testing everyday reading and vision in patients.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:columns --\u003e\u003c\/p\u003e\n\u003cdiv class=\"wp-block-columns\"\u003e\n\u003c!-- wp:column --\u003e\n\u003cdiv class=\"wp-block-column\"\u003e\n\u003c!-- wp:heading {\"level\":5} --\u003e\n\u003ch5\u003eFront\u003c\/h5\u003e\n\u003cp\u003e\u003c!-- \/wp:heading --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eNear Vision Card includes two small sections for repetitive testing and helps to minimize memorization.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003c!-- \/wp:column --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:column --\u003e\u003c\/p\u003e\n\u003cdiv class=\"wp-block-column\"\u003e\n\u003c!-- wp:heading {\"level\":5} --\u003e\n\u003ch5\u003eBack\u003c\/h5\u003e\n\u003cp\u003e\u003c!-- \/wp:heading --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eNear Vision Pocket Card features continuous text English format. This format helps to simulate everyday activities such as reading. This simulation leads to better testing of the patient and helps identify near vision problems that interfere with normal activities.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003c!-- \/wp:column --\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003c!-- \/wp:columns --\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921513242785,"sku":"2113-10%-1","price":19.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/2113-10.jpg?v=1776157237"},{"product_id":"berkeley-discs-contrast-sensitivity-test","title":"Berkeley Discs Contrast Sensitivity Test","description":"\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eDesigned by Dr. Ian Bailey of the University of California, Berkeley, School of Optometry. This test of contrast sensitivity has three double-sided cards. On each of the six sides, there is a 6-cell grid of 80 mm squares. On each of the sides, three of the 6 cells contain large (50mm) discs of different contrasts.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp id=\"video\"\u003eEach Card contains 6 Discs of varying individual contrast levels. The contrast sensitivity values are expressed in log units of contrast sensitivity using the Weber contrast ratio. See instructions below for further details.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:video {\"id\":82257,\"tracks\":\u003c\u003e} --\u003e\u003c\/p\u003e\n\u003cfigure class=\"wp-block-video\"\u003e\u003cvideo src=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/05\/52bf0a41-behind-the-test-berkeley-disc-test-landscape.mp4\" autoplay=\"autoplay\" muted=\"\" controls=\"controls\" width=\"100%\" height=\"100%\"\u003e\u003c\/video\u003e\u003c\/figure\u003e\n\u003cp\u003e\u003c!-- \/wp:video --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:columns --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:columns --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/0123c720-8001-berkeley-discs-instructions-2019-rev1.pdf?v=1776950815\"\u003eInstructions for the Berkeley Contrast Sensitivity Test\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921513373857,"sku":"8001","price":345.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/8b9743d7-8001-side-1_fannedout_web_image-scaled-1.jpg?v=1776157247"},{"product_id":"mayer-kran-double-happy-low-contrast-test","title":"Mayer-Kran™ Double-Happy™ Low Contrast Test","description":"\u003cp\u003eAssessment of contrast sensitivity (CS) is an important component of a comprehensive eye examination. The test should be administered by a vision health professional or a person trained in administering vision tests. The test results should be interpreted in the context of the individual’s overall presentation and the results of the individual’s eye examination. If the individual’s test shows abnormal results, we recommend retesting, preferably by a different tester who is unaware of the first tester’s results. A CS test does not replace the eye examination.\u003c\/p\u003e\n\u003cp\u003eThe Mayer-Kran™ Double-Happy™ Low Contrast Test consists of cards printed with a schematic smiling face. The face elements on each card are darker than the white card. The darkness of the face relative to the background is calibrated in percent contrast (Weber formula). Contrasts range from nearly black (89%) to very dim (2.2%). (Screening set -2.2%, Full set -0.8%). (The face contrast values are converted into log contrast sensitivity or logCS.)\u003c\/p\u003e\n\u003cp\u003eThe M-K Double-Happy Contrast Screening Test is offered with two options:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Screening Set\u003c\/strong\u003e is a set of 6 cards varying in Weber contrast: 89, 36, 25, 12.6, 6.3, 3.2, 2.2\u003c\/li\u003e\n\u003cli\u003elogCS Values are: 0.05, 0.45, 0.60, 0.90, 1.20, 1.50, 1.65\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Full Set\u003c\/strong\u003e is a set of 16 cards varying in Weber contrast: 89, 71, 50, 36, 25, 17.8, 12.6, 8.9, 6.3, 4.5, 3.2, 2.2, 1.6, 1.1, 0.8, Blank\u003c\/li\u003e\n\u003cli\u003elogCS Values are: 0.05, 0.15, 0.30, 0.45, 0.60, 0.75, 0.90, 1.05, 1.20, 1.35, 1.50, 1.65, 1.80, 1.95, 2.1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eThe logCS values can be related to difficulties in visually guided activities in adults. For example, logCS values ≤ 0.9 may be associated with a serious disability in walking, ≤ 1.3 may result in significant difficulties in recognizing faces, and \u0026lt;1.4 may cause significant limitations in reading (see instructions for further references).\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eInstructions May be Downloaded as follows:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e- \u003ca rel=\"noopener\" href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/06\/ab3e665a-dh-full-set-instructions_8x11_06162021_rev3_approved.pdf\" target=\"_blank\"\u003eFull Set Instructions\u003c\/a\u003e\u003cbr\u003e- \u003ca rel=\"noopener\" href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/06\/12add245-dh-screening-set-instructions_8x11_06162021_rev3_approved.pdf\" target=\"_blank\"\u003eScreening Set Instructions\u003c\/a\u003e\u003cbr\u003e- \u003ca rel=\"noreferrer noopener\" href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/07\/54227bfc-2012-double-happy-care-handling.pdf\" target=\"_blank\"\u003eCare and Handling Instructions\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca rel=\"noopener\" href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/06\/885edf3a-behind-the-test-double-happy-developers-qa.pdf\" target=\"_blank\"\u003eBehind The Test - Click here to read a question \u0026amp; answer session with the developers of Mayer-Kran™ Double-Happy™ Low Contrast Test\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:preformatted {\"style\":{\"typography\":{\"fontSize\":10}}} --\u003e\u003c\/p\u003e\n\u003cpre style=\"font-size: 10px;\" class=\"wp-block-preformatted\"\u003e*Teller Acuity Cards® is a U.S. registered trademark of the University of Washington and used under license.\u003c\/pre\u003e\n\u003cp\u003e\u003c!-- \/wp:preformatted --\u003e\u003c\/p\u003e","brand":"Double-Happy","offers":[{"title":"Full Set","offer_id":45921513439393,"sku":"2012-16","price":995.0,"currency_code":"USD","in_stock":true},{"title":"Screening Set","offer_id":45921513472161,"sku":"2012-6","price":395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/389fadf5-2012-web-image1-wshadow-scaled-1.jpg?v=1776157248"},{"product_id":"apex-2-5-contrast-sensitivity-test","title":"APEX 2.5 Contrast Sensitivity Test","description":"\u003cp style=\"font-weight: 400;\"\u003eAs the leader in manufacturing Gold Standard contrast sensitivity charts, Precision Vision released the new APEX2.5, taking contrast sensitivity testing to a new level!\u003c\/p\u003e\n\u003cp style=\"font-weight: 400;\"\u003eThis test delivers unmatched accuracy to +\/- 0.01 Log CS tolerance for each letter, a contrast range from 0.05 LogCS to 2.50 LogCS and a change of 0.05 LogCS for each letter. With 50 contrast steps on each chart, the APEX2.5 offers unrivaled quality, precision and test range.\u003c\/p\u003e\n\u003cp style=\"font-weight: 400;\"\u003eThis test is administered at a near distance (nominally at 40cm) and presents well with a table-top chart stand (sold separately).  The APEX2.5 is sold as a set of 3 charts and may be customized (please inquire for a quote if you require different optotypes), to offer you more flexibility with different patient populations.\u003c\/p\u003e\n\u003ch5\u003eProduct Features\u003c\/h5\u003e\n\u003ctable width=\"432\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eHighest Contrast (LogCS)\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e0.05 LogCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eLowest Contrast (LogCS)\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e2.50 LogCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eFrequency of contrast changes\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e0.05 logCS every letter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eNumber of contrast steps on chart\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eTolerance (LogCS) per Letter\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e+\/- 0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eM Letter Size \u0026amp; Snellen Acuity at 40 cm\u003c\/td\u003e\n\u003ctd width=\"179\"\u003eM 12.5  :   20\/625\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eLetters per Row\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eOptotypes\u003c\/td\u003e\n\u003ctd width=\"179\"\u003eSloan Letters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eAbility to Customize\u003cbr\u003e\n(additional optotypes available)\u003c\/td\u003e\n\u003ctd width=\"179\"\u003eYes, contact Precision Vision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003ePrinted Notations\u003c\/td\u003e\n\u003ctd\u003elogCS and Weber % contrast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eIncrement measures\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"253\"\u003eLuminance  (cdm\/Lux)\u003c\/td\u003e\n\u003ctd width=\"179\"\u003e85 cd\/m\u003csup\u003e2 \u003c\/sup\u003e\u003cbr\u003e\n(60-120cd\/m\u003csup\u003e2\u003c\/sup\u003e)\u003cbr\u003e\n(189-377 Lux)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Precision Vision","offers":[{"title":"Default Title","offer_id":45921514324129,"sku":"5025","price":385.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/c3937c78-apex-set-scaled-1.jpg?v=1776157243"},{"product_id":"trans-illuminated-contrast-sensitivity","title":"Trans-Illuminated Contrast Sensitivity","description":"\u003cp\u003e\u003cstrong\u003ePelli-Robson Trans-Illuminated Contrast Sensitivity Chart\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCat No 5016 for Low Vision\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e(Choose from the drop down menu when ordering)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCat No 5017 for Peak Contrast Sensitivity\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e(Choose from the drop down menu when ordering)\u003c\/p\u003e\n\u003cp\u003eThe trans-illuminated versions are identical to the original “Gold Standard” Pelli-Robson Contrast Sensitivity Charts. These charts cover ¾ of the original contrast range and are manufactured to the same true log steps and use the same letters and letter sizes as the originals.\u003c\/p\u003e\n\u003cp\u003eTrans-illumination has the advantage of uniform fixed illumination and eliminates the need for staging the room and verifying chart luminance with room lighting. These charts require using our ETDRS Illuminator Cabinet™, Cat. No.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"\/blogs\/newsletters\/etdrs-illuminator-cabinet-new-lamp-filter-tube-precision-vision\"\u003e2425 \u003c\/a\u003eand our 85 cd\/m2 lamp filter, Cat No\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"\/products\/85-cd-m2-lamp-filter-tube\/\"\u003e2427D85\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChart 5016\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003edesignated for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eLow Vision\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003euses the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eupper 12 contrast levels\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eranging from 0 – 1.65 Log CS (100% – 2.2% Weber).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChart 5017\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003edesignated for\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePeak Contrast Sensitivity\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003euses the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003elower 12 contrast levels\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eranging from 0.6 – 2.25 Log CS (25% – 0.56% Weber)\u003c\/p\u003e\n\u003cp\u003eThese charts are manufactured to tolerances better than the accepted standard of \/- .05 Log CS and\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eresearchers can order reports of actual contrast values\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eto accompany their chart at the time of ordering for an additional charge.\u003c\/p\u003e\n\u003cp\u003eThe “A” and “B” versions of each are different letter sets to minimize memorization. (Choose from the drop down menu when ordering)\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ PV Numbers \/ Full Set","offer_id":46117440651425,"sku":"5018A, 5018B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ PV Numbers \/ Full Set","offer_id":46117440684193,"sku":"5019A, 5019B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ PV Numbers \/ Scrambled Version B","offer_id":46117440716961,"sku":"5018B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Landolt C \/ Scrambled Version B","offer_id":46117440749729,"sku":"5022B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Landolt C \/ Scrambled Version A","offer_id":46117440782497,"sku":"5022A","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Landolt C \/ Full Set","offer_id":46117440815265,"sku":"5022A, 5022B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Landolt C \/ Scrambled Version B","offer_id":46117440848033,"sku":"5023B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Landolt C \/ Scrambled Version A","offer_id":46117440880801,"sku":"5023A","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Landolt C \/ Full Set","offer_id":46117440913569,"sku":"5023A, 5023B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ PV Numbers \/ Scrambled Version A","offer_id":46117440946337,"sku":"5018A","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Sloan \/ Full Set","offer_id":46117440979105,"sku":"5017A, 5017B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ PV Numbers \/ Scrambled Version B","offer_id":46117441011873,"sku":"5019B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ PV Numbers \/ Scrambled Version A","offer_id":46117441044641,"sku":"5019A","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Sloan \/ Scrambled Version B","offer_id":46117441077409,"sku":"5016B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Sloan \/ Scrambled Version A","offer_id":46117441110177,"sku":"5016A","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Low Contrast Visual Acuity - 0.56% - 25% \/ Sloan \/ Full Set","offer_id":46117441142945,"sku":"5016A, 5016B","price":600.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Sloan \/ Scrambled Version B","offer_id":46117441175713,"sku":"5017B","price":325.0,"currency_code":"USD","in_stock":true},{"title":"Peak Contrast Sensitivity - 2.2% - 100% \/ Sloan \/ Scrambled Version A","offer_id":46117441208481,"sku":"5017A","price":325.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/893c4fdc824f051f07606f44d5d60e5a_XL.jpg?v=1777615376"}],"url":"https:\/\/precision-vision.com\/collections\/contrast-sensitivity-tests.oembed","provider":"Precision Vision","version":"1.0","type":"link"}