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It is much more than just personal preference for many people. A form of color blindness (actually color deficiency rather than blindness) is called red-green weakness. This is VERY prevalent (in varying degrees of severity) in Caucasian males. I have it. I can't use red dot sights in anything other than indoor, dim light conditions. Ditto red lasers, and red fiber optics. I simply can't see them.\
Green dots and green lasers are not a problem.
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