Lea Single Symbol Book


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. 


  • Helps determine the best resolution of the visual pathway in a child/adult with amblyopia or impaired vision.
  • Single optotype line sizes from 20/200 to 20/8 (6/60 to 6/2.4) equivalent. 

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. 

Copyright © 2020- Pioneer International, Inc. All rights reserved.