For vision testing at 2 meters (6.5 ft.)
Acuity range 20M to 1M (20/200, 6/60 to 20/10, 6/3 equiv.)
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 are used for sight testing in several different settings including clinical studies, clinical exams, and low vision evaluations. ETDRS vision test are highly calibrated and have accurate, repeatable results. They are the only visual acuity test accepted in studies sponsored by the National Eye Institute. ETDRS visual acuity tests are the standardized format for vision testing.
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