Handheld vision test with LEA NUMBERS® numbers optotype features 50% spaced contour interaction bars to provide single optotype acuity with the proper crowding effect. Optotype line sizes from 20/100 to 20/20 (6/30 to 6/6) equivalent. This book can also be used for vision testing adults or geriatric patients. 17 pages. 4" x 4" (10.2 cm x 10.2 cm).
10 feet, 3 meters testing distance
Przelicznik skali Decimal/Snellen
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