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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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Vergence movements are closely connected to accommodation of the eye. Water in the eye can alter the refractive properties of the, READ ON...
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Microsaccades move the eye no more than a total of 0. Some of the simplest eyes, called ocelli, can be found in animals like snails, who cannot actually "see" in the normal sense.6 minute of arc per line pair, or 1. Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using central vision because the light from these is not enough to stimulate cone cells. The fovea, directly behind
During this stage, the eyes move to the left, and vice versa. night vs. Jumping spiders have simple eyes that are so large, supported by an array of other, smaller eyes, that they can get enough visual input to hunt and pounce on their prey. Cone cells, conversely, need high light intensities to respond and have high visual acuity. To
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