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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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This results in the high visual acuity, or the high ability to distinguish between detail, of cone cells and not rods.[6] This gradually changed, 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. Exaggerated convergence is called cross eyed viewing (focussing on the nose for example) .[2][3][4] The majority of the advancements in early eyes are believed to have taken only a few million years to develop, as the first predator to gain true imaging would have touched off an "arms race",[5] or rather, a phylogenetic
[12] The sclera gives the eye most of its white color. Cone cells, conversely, need high light intensities to respond and have high visual acuity. Too much light being let in could damage the retina; too little light makes sight difficult. The angle of the sharp vision being just a few degrees per second (Westheimer and McKee, 1954). As for the optic nerve, the impulses will be taken to the brain.In
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