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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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Similarly, while moving, the ability is further diminished unless there is another point of reference for determining speed; however the inaccuracy of speed or speed difference will always be present.[14][17] Within the anterior segment are two fluid-filled spaces: the anterior chamber and the posterior chamber. Cone cells, conversely, need high light intensities to respond and have high visual acuity. Some of the simplest eyes, called ocelli, can be found in animals like snails, who cannot actually "see" in the normal sense. The lens,
[12][15] The retina contains two forms of photosensitive cells important to vision—rods and cones. This is why the darker conditions become, the less color objects seem to have. The intensity of light (e. Without changing input, these cells would otherwise stop generating output. Hence, a dynamic contrast ratio of around 100:1 (about 6 1/2 stops). Exaggerated convergence is called cross eyed viewing (focussing on
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