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. Line sizes range from 10/80 to 10/5 (3/42 to 3/1.5) equivalent. The other equivalents featured on this chart are letter size, 20 foot, 6 meter, decimal, and LogMAR. 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: 10 feet/3 meters.

Note: These charts can either be wall mounted or used in an ESV1200™, ESV1500™, or a Model A+ illuminated cabinet.