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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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Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol, READ ON...
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Jumping spiders have simple eyes that are so large, supported by an array of other, smaller eyes, that they can get enough visual input to hunt and pounce on their prey. The eyes of cephalopods, fish, amphibians, and snakes usually have fixed lens shapes, and focusing vision is achieved by telescoping the lens—similar to how a camera focuses.The eyes can also follow a moving object around.[2][3][4] The majority of the advancements in early eyes are believed to have
The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells. The angle of the sharp vision being just a few degrees per second (Westheimer and McKee, 1954). It does have two points at which it is different; the fovea and optic disc. Most of the light refraction occurs at the cornea which has a fixed curvature.The maximum resolution of the human eye itself
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