{"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","url":"https:\/\/precision-vision.com\/products\/apex-2-5-contrast-sensitivity-test","provider":"Precision Vision","version":"1.0","type":"link"}