ETDRS low contrast Sloan Letter vision charts with proportionally spaced (geometric progression) lines. Features translucent low contrast letters with line sizes ranging from 20/200 to 20/10 (6/60 to 6/3) equivalent. Available in 5 Contrast levels: 1.25%, 2.5%, 5%, 10% and 25%.

The 2.5% Contrast Charts is offered in 2 versions (500021 & 500021A). Both charts have a 2.5% Contrast level but the optotypes are scrambled for repetitive testing situations.

Dimensions: 24.5" x 25.5" (62 cm x 65 cm).

Testing distance: 13 feet/4 meters.