LEA SYMBOLS^® Crowding Bar Book in 2.5% Contrast Set

A handheld vision test with LEA SYMBOLS^®. This test features 50% spaced contour interaction bars at 2.5% contrast to provide single optotype acuity with the proper crowding effect. Optotype line sizes range from 20/100 to 20/20 (6/30 to 6/6) equivalent. This book can also be used for vision testing of illiterate adults or geriatric patients. Includes a response key, a guide, and 17 pages.

Dimensions: 4" x 4" (10.2 cm x 10.2 cm).

Testing distance: 10 feet/3 meters.