LEA SYMBOLS® 2.5% Single Symbol Book Set250625
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 and instructions. 13 offset pages for easy flipping. 5" x 5" (12.7 cm x 12.7 cm).
10 feet/3 meters testing distance.