For vision testing at 2 meters (6.5 ft.)
Acuity range 20M to 1M (20/200, 6/60 to 20/10, 6/3 equiv.)
Test includes soft-tipped pointer, 50 recording forms (CAT. NO. 2514) and test instructions
Measures 62 X 65 cm (24.5 X 25.5 in.)
CAT. NO. 2425 Illuminator Cabinet is necessary with these translucent low contrast charts
Sloan optotypes are highly calibrated. They follow the idea of a 5x5 grid which makes all 10 optotypes very similar. Also, these 10 optotypes (C,D,H,N,K,O,S,V,R,Z)have been selected because not only do they meet that criteria, but they also have equal difficulties. By adhering to these guidelines, Sloan optotypes have become a standard in vision testing.
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