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
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 geometric progression from line to line, making only the optotype size a variable. Lines and optotypes have been calibrated to be equally difficult. ETDRS chart is reliable for accurate acuity testing in clinics, research, and studies world wide.