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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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Further, synaptic convergence means that several rod cells are connected to a single bipolar cell. It is attached to the ciliary body via, READ ON...
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During this stage, the eyes move rapidly.[16] [edit] Anterior segment The anterior segment is the front third of the eye that includes the anterior hyaloid membrane and all structures behind it: the vitreous humor, retina, choroid, and optic nerve. Because cone cells are all that exist directly in the fovea, astronomers have to look at stars through the "corner of their eyes" (averted vision) where rods also exist, and where the light is sufficient to stimulate cells,
Each sensor has its own lens and photosensitive cell(s). Most of these anatomic and physiologic processes follow a gradual decline. [edit] Anterior and posterior segments The mammalian eye can also be divided into three main layers or tunics whose names reflect their basic functions: the fibrous tunic, the vascular tunic, and the nervous tunic.[12][14][15] The choroid contains blood vessels that supply the retinal cells with necessary oxygen and remove the waste products
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