Hello! Do you need help? Click on the operator and write to us.
Sloan Letters C, D, H, K, N, O, R, S, V, Z proportionally spaced (geometric progression) lines - range from 20/200 to 20/10 (6/60 to 6/3) equivalent - revised version with each line being equally difficult - measures 24.5" x 25.5" (62 cm x 65 cm) - 10 feet, 3 meter testing distance