{"product_id":"tumbling-e-4-meter-etdrs-folding-chart","title":"Tumbling \"E\" 4 Meter ETDRS® Folding Chart","description":"\u003cp\u003eThis Tumbling \"E\" ETDRS® Folding Chart is meant for 4 Meter Testing and can be hand-held or wall-mounted. It folds in half making it very convenient to transport.\u003c\/p\u003e\n\u003cp\u003eThere are three iterations (Standard, Scrambled A, and Scrambled B) available which may be used to reduce memorization when repeatedly testing and\/or to reduce memorization when testing OD, OS, and OU (Oculus Dexter, Oculus Sinister and Oculus Uterque).\u003c\/p\u003e\n\u003cp\u003eDeveloped in 1976, Tumbling E charts were intended for testing illiterate patients and those not familiar with the Roman Alphabet. The Tumbling E vision tests are considered highly useful for testing foveal vision and has a high visual acuity threshold. The construction of the letter E is similar and gives the effect of gratings. The Tumbling E chart is also useful for detecting signs of Astigmatism.\u003c\/p\u003e\n\u003cp\u003e\u003c!-- wp:paragraph --\u003e\u003c\/p\u003e\n\u003cp\u003eConstructed with the same precision, accuracy, and methodology as traditional ETDRS® charts. Lines are of equal difficulty. Geometric progression in letter size from line to line. Letter size is only variable.\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\u003eClick additional information to the above for more specifications.\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\u003ca href=\"https:\/\/storage.googleapis.com\/stateless-precision-vision\/2021\/02\/0cffc0ef-etdrs-reprint.pdf\"\u003e\u003cmark class=\"has-inline-color has-vivid-red-color\" style=\"background-color: rgba(0, 0, 0, 0);\"\u003eRead More On ETDRS®\u003c\/mark\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c!-- \/wp:paragraph --\u003e\u003c\/p\u003e","brand":"Precision Vision","offers":[{"title":"Original Version","offer_id":45921488175265,"sku":"2305Folding","price":84.0,"currency_code":"USD","in_stock":true},{"title":"Scrambled Version A","offer_id":45921488208033,"sku":"2305FoldingA","price":84.0,"currency_code":"USD","in_stock":true},{"title":"Scrambled Version B","offer_id":45921488240801,"sku":"2305FoldingB","price":84.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4321\/7569\/files\/90c8a860751b252e58c26f97e05856c4_XL.jpg?v=1776157162","url":"https:\/\/precision-vision.com\/products\/tumbling-e-4-meter-etdrs-folding-chart","provider":"Precision Vision","version":"1.0","type":"link"}