Asklemmy

Hearing aids aren't really comparable. You still hear fine, but volume needs to be at a higher intensit. Hearing aids solve the problem with simple amplification. Corrective lenses for myopia and hyperopia are similar, correcting errors in something that's essentially just calibrated wrong.

Color blindness is more like being deaf. Don't think of your eyes as being one input generating a single image, but each eye being four inputs generating four images that are then composited. With color blindness, at least one of those pre-composite images is just not being generated at all. Like how a genuinely deaf person can't benefit from hearing aids because they don't have funcional ears, a colir blind person can't get new colors from simple lenses because they don't have cones capable of detecting those colors.

You can play music really loud for someone who's hearing is degrading and they'll hear it fine if it's loud enough, but you can't get someone who is red-green color blind to see green by ramping up the intensity of the green; they can't see that color for much the same reason I can't see ultraviolet or infrared.