Sloan Letter Low Contrast Flip Chart
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: black, 25%, 10%, 5%, 2.5%, and 1.25%. Pages are offset for easy flipping. Each chart includes recording forms and instructions. 6 pages, 3.25" x 9" (8.25 cm x 22.9 cm).