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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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These changes contribute to the etiology of several eyelid disorders such as ectropion, entropion, dermatochalasis, and ptosis. A Snellen, READ ON...
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As soon as the eye moves (saccades) it re-adjusts its exposure both chemically and by adjusting the iris. This is an almost pure rotation, with only about one millimeter of translation.The eyes can also follow a moving object around. Possessing detailed hyperspectral color vision, the Mantis shrimp has been reported to have the world's most complex color vision system. When the muscles exert different tensions, a torque is exerted on the globe that causes it to turn. In one degree,
Without changing input, these cells would otherwise stop generating output. The narrow beam of sharp vision in the middle of the retina, the fovea centralis, the rest of the field of view, the brain thus perceiving an observation of a wide sharp field of view. For example, no human can with reasonable accuracy, visually determine the speed of an approaching train in the evening as they could during the day.
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