Includes: Isolating mask, Response key, Flashcards, and Instructions.
Testing Distance: 10 feet, 3 meters
Book Dimensions: 5" x 5" (12.7 cm x 12.7 cm)
Book Length: 13 pages
The Single Symbol Book is ideal for testing children and adults who have difficulties in the perception of symbols in lines.
Benefits: 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.