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LEA SYMBOLS® 2,5 % Single Symbol Book 52236
LEA SYMBOLS® 2,5 % Single Symbol Book
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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. This book also provides decimal and logMAR scales for each line size. Includes isolating mask, response key, instructions, and 13 offset pages for easy flipping.
Dimensions: 5" x 5" (12.7 cm x 12.7 cm).
Test distance: 10 feet/3 meters.
Przykładowe przeprowadzenie badania : https://www.good-lite.com/instructions/250600.cfm
Instrukcja użytkowania
Przelicznik skali Decimal/Snellen
