The LEA SYMBOLS 2.5% Single Symbol Book Set is a low contrast tool to measure visual acuity in low-light environments. The testing procedure is identical to measuring visual acuity at high contrast. The 2.5% test is the most practical low contrast test for clinical use. Single optotype line sizes from 20/200 to 20/8 (6/60 to 6/2.4) equivalent. Also provides decimal and logMAR scales for each line size. Includes isolating mask, response key, training cards, and instructions. 13 offset pages for easy flipping. 5" x 5" (12.7 cm x 12.7 cm).
10 feet/3 meters testing distance
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