Contrast chart 4 "Pelli-Robson"

This is the single chart 4, in addition to the Pelli Robson chart set. The whole set (which can be ordered as item no. 80242) includes 2 charts (with different optotype orders) and a block wit 50 answer sheets. Chart size: 60 x 80cm. Contrast levels: 100% to 0,6%. Test distance: 1m. With sloan letters, positioned in triplets for each contrast level. Answer sheets can be ordered: Item 80815.