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.
Note: All products sold on Accuspire.com should be used by qualified clinician and should be purchased by or on order of a qualified clinician.
The Single Symbol Book is designed for testing children and adults who have difficulties perceiving symbols in lines. The visual acuity values measured with single symbols are often several lines...
A handheld pediatric vision chart with LEA SYMBOLS® designed for amblyopia testing or screening. The 50% spaced rectangles (Massachusetts Visual Acuity Test format) have line sizes from 20/80 to...
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A set of 30 pediatric acuity cards featuring 2 of the LEA SYMBOLS® optotypes with 50% crowding bars. Each card contains a single symbol with line sizes ranging from 20/200 to 20/8 (6/60 to 6/2.4)...
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