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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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Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 stops) is possible. A diopter is the unit of measure of optical power. The, READ ON...
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This area is called the fovea, and covers about 2 degrees of visual angle in people. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The number of lenses in such an eye varied, however: some trilobites had only one, and some had thousands of lenses in one eye. Too much light being let in could damage the retina; too
The vestibulo-ocular reflex is a reflex eye movement that stabilizes images on the retina during head movement by producing an eye movement in the direction opposite to head movement, thus preserving the image on the center of the visual field. The process is nonlinear and multifaceted, so an interruption by light nearly starts the adaptation process over again.25 = 9000 pixels in each of the X and Y dimensions, or
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