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The Evolution of Human Skin Pigmentation
The skin responds to routine exposure to the sun by becoming thicker, like the epidermis becomes thicker. This protective pigment that gets created called you melanin is not created in as high an amount if you're blocking the exposure of the retina to sunlight. You'll rarely see me wearing sunglasses. One of the reasons for that is because you absorb more damaging ultraviolet radiation when you're wearing sunglasses.