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> the area with the color they can't see gets a lot darker

Interestingly, for me (deuteranomolous) the colors I can't see often seem lighter. For example, green traffic lights appear white. I assumed this is because I can still see the light, it just doesn't get interpreted as green, but I don't know whether that's true.

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Green lights are white to me as well, I guess they have a decent chunk of blue in them and people call them green due to the lack of red. (I see blue + green as white since I don't see red)

But if you see it as white as well then I'd expect your problem to be with the color red and not the color green.

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