Mars Perceptrix specializes in contrast sensitivity testing, offering accurate and convenient measurements for eye care professionals, occupational testers, and clinical researchers worldwide. Their Mars Contrast Sensitivity Tests assess the lowest contrasts patients can perceive, focusing on contrast rather than letter size. These tests are used for monitoring disease progression, assessing contrast sensitivity pre and post-intervention, occupational testing, identifying functional losses, and clinical trials. The tests are hand-held, feature 48 different contrast levels, and are designed for near-vision testing. Mars Perceptrix's charts are rapid to administer, available in letter and numeral versions, and CE-marked as medical devices for sale in the European Economic Area.