This book features 50% spaced contour interaction bars to provide single optotype acuity with the proper crowding effect. Optotype line sizes from 20/100 to 20/16 (6/30 to 6/4.8) equivalent. Includes re-sponse key, flash cards, and instructions. 17 pages. 4" x 4" (10.2 cm x 10.2 cm).
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