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When you look at a very bright source of light, such as the Sun, what causes the pain reflex and makes you close your eyes? I ask because I've read that IR light, typically from lasers, will not trigger this response, so I assume that the reflex isn't caused by your eye being damaged, but by something else.
Also, if someone were to be blind due to a defect in their brain, and their eyes were completely functional, would they experience pain when they looked at a bright source of light?
Also, if someone were to be blind due to a defect in their brain, and their eyes were completely functional, would they experience pain when they looked at a bright source of light?