5% ETDRS Sloan Letter Contrast Chart for 10 feet (3 meters)500028
A 5% Contrast Sloan Letter vision chart with proportionally spaced (geometric progression) lines; line sizes range from 10/100 to 10/5 (3/30 to 3/1.5) equivalent. The other equivalents featured on this chart are letter size, 20 foot, 6 meter, decimal, and LogMAR. This chart is part of the revised versions of the original ETDRS series with each line being equally difficult.
Dimensions: Height 24.5" x Width 25.5" (62 cm x 65 cm).
Testing distance: 10 feet/3 meters.