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Human Visual System

Such changes can presage danger, indicate a source of food, a mate, resynchronize the circadian clocks----all of which are intimately connected with survival. Therefore vision must have been under intense evolutionary pressure to improve to an optimum level consonant with the overall economy of the organism. That is, Darwin’s concept of the origin and improvement of vision through natural selection explains why the eyes of higher organisms perform so well, without the need of teleological argument.