I wonder if the times when Cyclops can see without the need for a visor/glasses, such as when Jean Grey has controlled his blasts or that stint in the comics when he regained control, if his colour perception/clarity is normal or if it's actually been permanently affected by seeing shades of only one (or two, depending who you're asking) colours for most of his days? 

Like, if you close your eyes and stare in the direction of the sun for a while (seeing a lot of red/orange from the back of your eyelids), then open them, the world is a lot bluer/softer for a time. It's brief because you did it briefly, but would it be if you did something like that for all of your waking hours for years?!