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 better than the line acuity values in persons with impaired vision and thus overestimate the quality of visual functioning. This book features single optotype line sizes from 20/200 to 20/8 (6/60 to 6/2.4) equivalent, 0.10 to 2.50. Includes isolating mask, response key, instructions, and 13 offset pages for easy flipping.
Dimensions: Width 5.75" x Height 5.44" (14.61 cm x 13.82 cm).
Testing 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 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...
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...
The Crowded Symbol Book is designed for testing children and adults who have difficulty reading the optotypes on the big charts. This test is the smallest line test when the central symbol is used as...
This test is designed for amblyopia screening and testing children who have difficulties when tested with the standard distance charts (#250250 or #250150). The background is gray with the...
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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