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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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Rapid eye movement, or REM for short, typically refers to the stage during sleep during which the most vivid dreams occur. the corneal, READ ON...
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the corneal endothelium) and the iris, whereas the posterior chamber is between the iris and the front face of the vitreous. If, for example, the red and green cones are stimulated to the same extent, and no blue cones are stimulated, yellow is seen. If all three forms of cones are stimulated equally, then white is seen. It is largely responsible for color vision in humans, and enables high acuity, such as is necessary
One form is broken down by the particular EM wavelength that is red light, another green light, and lastly blue light. The process through which these proteins go is quite similar—upon being subjected to electromagnetic radiation of a particular wavelength and intensity, the protein breaks down into photopsin and retinal. In many animals, including humans, eyelashes prevent fine particles from entering
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