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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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Other animals have other ranges, with many such as birds including a significant ultraviolet (shorter than 400 nm) response. But because several "converge" onto a bipolar cell, enough transmitter molecules reach the synapse of the bipolar cell to hyperpolarize it. Cone cells, conversely, need high light intensities to respond and have high visual acuity. Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco.[12][14][15] The choroid
The structure of 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. To clearly see an object far away, the ciliary muscle contracts, the tension of the fibers decrease (imagine that the distance between the tip of the triangle to the other two tips. To maximise vision
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Due to many variances we cannot guarantee that the colors displayed on the color chart pages will ... Computer monitors display up to millions of colors and the human eye can only decipher a very small ...
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RETURN TO YOUR PREVIOUS PAGE BY USING YOUR COMPUTER'S HISTORY OR BACK BUTTON . Human Hair Color Chart ... In wig photo see color at eye level . 51
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