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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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In this, they differ from most other arthropods, which have soft eyes. When the muscles exert different tensions, a torque is exerted, READ ON...
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They do have photosensitive cells, but no lens and no other means of projecting an image onto these cells. So a human can resolve distances of about 0. Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 stops) is possible. Prey animals and competing predators alike would be forced to rapidly match or exceed any such capabilities to survive. Rhodopsin, of rods, breaks down into opsin and retinal; iodopsin of cones breaks down into photopsin and retinal. It consists
[12][14][15] The choroid contains blood vessels that supply the retinal cells with necessary oxygen and remove the waste products of respiration. To clearly see an object far away, the ciliary muscle contracts, the tension of the fibers decrease (imagine that the distance between the tip of a triangle to its base, is less than the tip of a triangle
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