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I am not a medical person, but I can give you a few thoughts on colorblindness and flying. I, like 5% of all males (but virtually no females), have some colorblindness. This was discovered during an FAA physical where they show you the standard color circles and you have to pick the number hidden in the colors. I get 80-90% correct, but the 10-20% I can't see correctly required that I obtain a Demonstrated Ability Waiver for color before I could fly at night. For the waiver they stand you at the edge of the airport and shine the light signals at you (in no particular order) from the tower. You have to correctly identify the color of the lights to pass.
There are no cures/corrections for colorblindness - it is a genetic fault. Most people are not so affected that it makes much difference in their everyday life, but it is important to be able to see the colors of the lights when flying an airplane.
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