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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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Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments, READ ON...
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Some arthropods, including many Strepsiptera, have compound eye composed of a few facets each, with a retina capable of creating an image, which does provide multiple-image vision. In one degree, a human would not be able to distinguish more than about 12 lines without the lines blurring together. Possessing detailed hyperspectral color vision, the Mantis shrimp has been reported to have the world's most complex color vision system. The visual fields of some such complex eyes largely overlap, to allow better depth perception (binocular
With aging a prominent white ring develops in the periphery of the cornea- called arcus senilis.Visual acuity can be measured with several different metrics. Eyes in various animals show adaptation to their requirements. Formation of a nontransparent ring allows more blood vessels, more circulation, and larger eye sizes. Fine particles can be bacteria, but also simple dust which can cause irritation of the
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