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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 humans, the eyebrows redirect flowing substances (such as rainwater or sweat) away from the eye. Without changing input, these cells, READ ON...
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Without changing input, these cells would otherwise stop generating output. Fine particles can be bacteria, but also simple dust which can cause irritation of the eye, and lead to tears and subsequent blurred vision. The visual fields of some such complex eyes largely overlap, to allow better depth perception (binocular vision), as in humans; and others are placed so as to minimize the overlap, such as in rabbits and chameleons. Light enters the eye from an external
It is largely responsible for color vision in humans, and enables high acuity, such as is necessary in reading. Eye transplants can happen but the person receiving the transplant will not be able to see. They both contain different pigmented photoreceptor proteins. If none are stimulated, black is seen. The opsin in both opens ion channels on the cell membrane which leads to hyperpolarization, this
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