Testing is identical to the measurement of visual acuity at high contrast level; i.e., to measure the smallest size of the optotypes that an individual can recognize correctly. The 2.5 % test is the most practical in clinical use. Available in 5 contrast levels: 25%, 10%, 5%, 2.5%, and 1.25%.
Each chart includes response key, flash cards and instructions.
Charts measure 9” x 14” (23 cm x 36cm) which fits the Quantum Series of Illuminated Cabinets. Can also be hung on the wall.
253700, 253800, 253900, 254000, 254100.
Tags: Lea Symbols, Low Contrast, Charts - 25%