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Handheld vision testing book features HOTV optotypes with 50% contour interaction bars to provide single optotype acuity with the proper crowding effect. Optotype lines sizes from 20/100 to 20/16 (6/30 to 6/4.8) equivalent. Includes response panel, flash cards, and instructions. 17 pages. 4" x 4" (10.2 x 10.2 cm).
10 feet, 3 meter testing distance