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What are ETDRS® Charts? Traditional Snellen Eye Chart for Vision Testing at 6 meters (20 feet). SKU: 5002. To understand what an ETDRS® chart is, we should first discuss why the ETDRS® charts were designed.
ETDRS chart: The ETDRS chart was described by Ferris and colleagues at the National Eye Institute, United States. The ETDRS chart uses a luminance of 160 cd/m 2. Each optotype (Sloan letter, see below) has the same height and width; the ratio is 5:5. Thus, these letters are wider compared to the letters of the Bailey-Lovie chart. The ETDRS ...
Includes the full range of vision tests, including acuity, astigmatism, convergence, color, depth, etc. and the proprietary VectorVision contrast sensitivity and glare tests. Standardized to the testing light level recommended by the FDA and ANSI. Easy-to-use remote control allows rapid integration into patient flow.
Regular eye examinations using the ETDRS chart and scale can help detect early signs of diabetic retinopathy and allow for timely treatment to prevent further vision loss. The ETDRS scale is based on the logMAR scale, which is a commonly used method for expressing visual acuity.
Charts originally developed for the Early Treatment in Diabetic Retinopathy Study (ETDRS) and subsequently refined have become the gold standard in ophthalmology research and are based on the design principles of Bailey and Lovie; they have logarithmic scales, 5 optotypes per line, and geometric progression in letter size and spacing. 1,2 The le...
To compare the results of visual acuity (VA) measured by Early Treatment Diabetic Retinopathy Study (ETDRS) chart, 5 m Standard Logarithm Visual Acuity (5SL) chart, and 2.5 m Standard Logarithm Visual Acuity (2.5SL) chart in outpatients of age 12-80y.
The ETDRS chart has been introduced as a standardized visual acuity (VA) testing chart for the Early Treatment of Diabetic Retinopathy Study (ETDRS). It uses 14 lines of 5 Sloan letter optotypes in each line in logarithmic progression.