For aircraft controls, for instance, a glass cockpit with bar graphs that change red/green, I think that might be OK, because isn't it true that you can't be a commercial pilot if you're color blind? I could be wrong about that. I think my information on this topic comes from an old episode of Northern Exposure. :-) But anyway, might point is, though that might be acceptable for a plane, it's not acceptable for a car.
14 CFR Part 67: (the pilot must have) "the ability to perceive those colors necessary for the safe performance of airman duties" for all medical certification classes.
Color blindness prevents a successful Class I Medical certificate. Class II is still possible, but the limitation is on any night flights and using color signal controls, which means no airports that use color signals for ground guidance.
Edit: That should be 'certain colorblindness'. Specifically the ability to distinguish between white, green, and red/amber.
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