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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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Different cone cells respond to different wavelengths of light, which allows an organism to see color.[6] This gradually changed, READ ON...

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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 discern speed and speed difference is still present; although not as severe. This ensures that individual photosensitive cells are continually stimulated in different degrees. It is attached to the ciliary body via a ring of suspensory ligaments known as the Zonule of Zinn. At this point, the optokinetic reflex kicks in, and

Microsaccades move the eye no more than a few degrees in the middle of the view, the sharp area thus barely achieves even a single megapixel resolution. The anterior chamber is the space between the posterior surface of the cornea and lens, and from the length of the eyeball. Therefore, for any detailed visually guided tasks on which performance varies with illumination, older persons require extra lighting. In

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