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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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Because of the smaller pupil size, older eyes receive much less light at the retina. So a human can resolve distances of about 0., READ ON...
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Rod cells are highly sensitive to light allowing them to respond in dim light and dark conditions, however, they cannot detect color. Compound eyes are very sensitive to motion.7 mm at 1 m).[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate directional brightness by using the angle at which the light hit certain cells to identify the source. Prey animals and competing predators alike
Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco.[1] Trilobites, which are now extinct, had unique compound eyes. The fovea, directly behind the lens, consists of mostly densely-packed cone cells. Most of the time however, the three forms are stimulated to different extents—resulting in different colors being seen. Some arthropods, including many Strepsiptera, have compound eye composed
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