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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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Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes.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. Separation of the forward layer again forms a humour, the aqueous humour. For

Blinking the eyes is, of course, also a reflex. The process is nonlinear and multifaceted, so an interruption by light nearly starts the adaptation process over again. A Snellen chart is one type of eye chart used to measure visual acuity. When looking into the distance, or when 'staring into nothingness', the eyes neither converge nor diverge. * The nervous tunic, also known as the tunica fibrosa oculi, is the

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New York laser eye surgery practice specializing in refractive surgery. Located in Manhattan, NY ... About Dr. James Kelly. James R. Kelly, MD received his undergraduate degree from Columbia ...