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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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At this point, the optokinetic reflex kicks in, and moves the eye, READ ON...
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When, for example, looking out of the window in a moving train, the eyes can focus on a 'moving' tree for a short moment (through smooth pursuit), until the tree moves out of the field of vision.The retina has a static contrast ratio of around 100:1 (about 6 1/2 stops). Furthermore, color is distinguishable when breaking down the iodopsin of cone cells because there are three forms of this protein. Different cone cells respond to different wavelengths of light, which allows
When an observer views an object in motion moving away or towards himself, there is no eye movement occurring as in the examples above, however the ability to slightly discriminate directional brightness by using the angle at which the light hit certain cells to identify the source. Thus, for humans to be able to see.Compound eye of Antarctic krill. Possessing detailed hyperspectral color vision, the Mantis
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