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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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Jumping spiders have simple eyes that are so large, supported by an array of other, smaller eyes, that they can get enough visual, READ ON...
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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). The narrow beam of sharp vision is easy to test by putting a fingertip on a newspaper and trying to read the text while staring at the fingertip — it is very difficult to read text that's just some centimeters away from the fingertip. This is made apparent when swimming in freshwater
To look at an object at a different distance will automatically cause vergence and accommodation. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light. With each eye viewing a different angle, a fused image from all the eyes is produced in the brain, providing very wide-angle, high-resolution images. The extent to which the pupil dilates also
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