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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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These are the cells which allow humans and other animals to see by moonlight, or with very little available light (as in a dark room). These include myopia, hyperopia, and astigmatism. Rods and cones are both photosensitive, but respond differently to different frequencies of light. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. Independently, a transparent layer and a nontransparent
These are then transmitted to the eye. The differences are useful; apart from enabling sight in both dim and light conditions, humans have given them further application. The opsin in both opens ion channels on the cell membrane which leads to hyperpolarization, this hyperpolarization of the cell leads to a release of transmitter molecules at the synapse. The vitreous gel undergoes liquefaction (posterior vitreous detachment or PVD) and its opacities—visible as floaters—gradually
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