a low contrast test is a special way to measure visual acuity and determining how well eyes function in low light situations and/or being able to distinguish objects from similarly colored or shaded backgrounds - testing is identical to the measurement of visual acuity at high contrast level - the 2.5% test is the most practical test in clinical use - available in 5 contrast levels: 1.25%, 2.5%, 5%, 10%, and 25% - this chart can either be wall mounted or used in an 50.028.00 illuminated cabinet - VA from 0.12 to 2.5 - 10 feet/3 meters testing distance - chart size 9"x14" (23x 36 cm) -