These Sloan Letter adult low contrast testing charts are identical to the measurement of visual acuity at a high Contrast level; i.e., measures the smallest size of the optotypes that the person can recognize. The 2.5% test is the most practical test in clinical use. These charts are available in 1.25%, 2.5%, 5%, 10%, and 25% Contrast levels. Each chart includes recording forms and instructions.

Dimensions: 9" x 14" (22.9 cm x 35.6 cm).

Testing distance: 10feet/3 meters.