For 1st and 2nd Class certification an additional Medical Flight Test is also required as well. For all classes an OCVT is administered which consists of an aeronautical chart interpretation and a signal light test. All pilots seeking to remove color vision restrictions or to obtain a “Letter of Evidence” must request a letter of authorization from AMCD or the RFS to take the testing. The only way to get a permanent “Letter or Evidence” or to remove a color vision limitation from their medical is for the airman to request a one time opportunity to take an operational color vision test (OCVT) at their local FSDO. Now such testing has to be passed with each subsequent examination.
This would excuse the airman for further future color vision testing. Historically, the FAA would grant permanent “Letters of Evidence” based on passing one of the less common alternate color vision tests outlined in the Guide to AMEs and listed above. Monochromats view colors similar to the perception from a black and white television. An extremely rare condition called “monochomatism” leaves an individual with the absence of color sensation. (See the AMAS article on Optimum Vision and Eye Protection). Individuals with normal vision may simulate these altered color perceptions by looking through colored glasses, which is why sunglasses should be a neutral color. These individual might be called “color weak”. Contrary to popular belief, most of these individuals are not “color blind”, rather their perception of color varies from normal individuals. About 8% of Caucasian males carry such a trait. Because men have a single X chromosome and women have two X chromosomes, men are much more likely to be color deficient that women. Color vision deficiencies are a genetically recessive trait, meaning that if at least one gene for color vision is normal, the individual will have normal color vision. Because the gene for color vision is found on the X chromosome, color deficiencies are more frequently found in men than in women.
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