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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 is in direct contrast to the situation with cones, where each cone cell is connected to a single bipolar cell, which then connects, READ ON...
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Humans gradually lose this flexibility with age, resulting in the inability to focus on nearby objects, which is known as presbyopia.The structure of the mammalian eye owes itself completely to the task of focusing light onto the retina. The number of lenses in such an eye varied, however: some trilobites had only one, and some had thousands of lenses in one eye. This ensures that individual photosensitive cells are continually stimulated in different degrees. As for the
If a ray of light were to reach just one rod cell this may not be enough to hyperpolarize the connected bipolar cell. Compound eyes are found among the arthropods and are composed of many simple facets which give a pixelated image (not multiple images, as is often believed). If, for example, the red and green cones are stimulated to different extents—resulting in different colors being seen. When the muscles
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