For vision testing at 4 meters (13 ft.)
Acuity range 40M to 2M (20/200, 6/60 to 20/10, 6/3 equiv.)
Only standardized format accepted in studies sponsored by the National Eye Institute
Designed for use in clinical studies and low vision evaluations where accurate, repeatable visual acuity measurements are required
Lines are of equal difficulty
Geometric progression in letter size from line to line
Letter size is only variable
Measures 62 X 65 cm (24.5 X 25.5 in.)
Eye Chart fits the ETDRS Illuminator Cabinet CAT. NO. 2425
Can be wall-mounted
ETDRS charts use a series of three charts with different permutations of optotypes. ETDRS "Chart 1" is used to test the right eye's acuity. ETDRS "Chart 2," and "Chart R" are used to test the visual acuity in the left eye and both eyes, respectively. The use of three ETDRS eye charts to test the visual acuity of one patient prevents memorization and helps increase accuracy and consistency in results.
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