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Different kinds of light sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The visual fields of some such complex eyes largely overlap, to allow better depth perception, as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons.
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While still, the eye can measure relative speed with high accuracy, however under movement relative speed is highly distorted. This is less accurate than the vestibulo-ocular reflex as it requires the brain to process incoming visual information and supply feedback. In humans, the eyebrows redirect flowing substances (such as rainwater or sweat) away from the eye.[19] Assuming two pixels per line pair (one pixel per line) and a square field of 120 degrees, this would be equivalent to approximately 120×60×1. * The nervous
The visual fields of some such complex eyes largely overlap, to allow better depth perception (binocular vision), as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons. The fovea, directly behind the lens, consists of mostly densely-packed cone cells. Another complication for vision in frontal-eyed animals is the development of a small area of the
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