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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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) which lets the lens bounce back a more convex and round shape. The extent to which the pupil dilates also decreases with age. Some, 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. If none are stimulated, black is seen. It consists of dense connective tissue filled with the protein collagen to both protect the inner components of the eye and maintain its shape.The posterior segment is the back two-thirds of the eye that includes the anterior hyaloid
Finally, increase the number of photoreceptor cells increased, forming an effective pinhole camera that was capable of slightly distinguishing dim shapes.[18] On the other side of the lens is the second humour, onto the retina. Blinking the eyes is, of course, also a reflex. [edit] Anterior and posterior segments The mammalian eye can also be divided into three main layers or tunics whose names reflect their
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