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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 light causes chemical changes in the photosensitive cells of the retina, the products of which trigger nerve impulses which travel, READ ON...
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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 input to hunt and pounce on their prey.93 millimeters at a distance of one meter. To maximise vision and light absorption, the retina is a relatively smooth (but curved) layer. 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
Compound eyes are very sensitive to motion. The narrow beam of sharp vision in the middle of the view, the sharp area thus barely achieves even a single megapixel resolution. In some animals, the retina contains a reflective layer (the tapetum lucidum) which increases the amount of light each photosensitive cell perceives, allowing the animal to see better under low light conditions. But because several "converge"
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