For vision testing at 2 meters (6.5 ft.)
Acuity range 20M to 1M (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
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 acuity eye tests use geometric progression from line to line. Because of this standardized progression, the vision test can be administered accurately from several distances including 4, 3.2, 2.5, 2, 1.6, 1.3, and 1 meter(s). These standardized variations in testing distance help accommodate vision testing in different clinical situations.
IS
