ColorDx

Colour vision and contrast sensitivity are important functions of the visual system, which may be affected by many diseases, disorders and common substances. Understanding if, and how much these functions are affected, may assist clinical decision making and help doctors educate patients about the risks and consequences of their condition.

Testing for acquired colour vision deficiencies may be one of the most underutilized measures of functional vision. Commonly used colour vision tests historically (such as printed pseudo-isochromatic, “Ishihara plates”, designed more than a century ago), may only test L and M-cone deficiencies, completely missing all S-cone (blue) deficiencies as well as being not quantitative. Genetic colour vision deficiencies, most commonly affect males as a sex-linked trait and most commonly affect the L or M-cones.