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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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In some animals, the retina contains a reflective layer (the tapetum lucidum) which increases the amount of light each photosensitive, READ ON...
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Cone cells, conversely, need high light intensities to respond and have high visual acuity.In many species, the eyes are inset in the portion of the skull known as the orbits or eyesockets. Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 stops) is possible. Hence multiple eye types and subtypes developed in parallel. At this point, the optokinetic reflex kicks in, and moves the eye back to the point where it first saw the tree (through a saccade). Different
Microsaccades move the eye at up to 100°/s in adult humans. night vs. But because several "converge" onto a bipolar cell, enough transmitter molecules reach the synapse of the bipolar cell to hyperpolarize it.[7] The thin overgrowth of transparent cells over the eye's aperture, originally formed to prevent damage to the eyespot, allowed the segregated contents of the eye and suspends
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