easily measure, record, and detect changes in the transfer of visual information when the change affects only visual acuity at low contrast levels – charts include the following contrast levels: 25%, 10%, 5%, 2.5%, and 1.25% – pages are offset for easy flipping – each chart includes recording forms and instructions – 5 pages, 3.25″ x 9″ (8.25 cm x 22.9 cm)
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