Inherited color vision deficiency affects approximately 8% of the male Caucasian population, 5% of non-Caucasian males, and 0.4% of all women. In addition, significant numbers of patients of both genders acquire color vision loss due to ocular disease or pharmaceutical medications.
Yet in many clinical settings color vision testing presents a challenge because plate tests, like those designed by Ishihara, do not easily differentiate green (deutan) from red (protan) defects. Tests that do differentiate, like the Farnsworth D-15, show false positive results with mild to moderate anomalous trichromacy, and are time-consuming. In addition, both require proper lighting to administer.
To screen for color vision deficiencies, and accurately diagnose them when they are found, a reliable automated test would be desirable, as it could be run by technicians and aid the optometrist in interpretation.
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