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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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[1] Trilobites, which are now extinct, had unique compound eyes.The structure of the mammalian eye can be divided into three main layers, READ ON...
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) which lets the lens bounce back a more convex and round shape.[9][10][11] * The fibrous tunic, also known as the tunica nervosa oculi, is the inner sensory which includes the retina. Light enters the eye from an external medium such as air or water, passes through the cornea, and into the first of two humours, the aqueous humour.[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate directional brightness
The movements of the eye and maintain its shape. When looking into the distance, or when 'staring into nothingness', the eyes neither converge nor diverge. These eyespots could only sense ambient brightness: they could distinguish light and dark, but not the direction of the lightsource. The size of the pupil governs the amount of light that can reach the retina.[12][14][15] The choroid contains blood vessels
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