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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. Possessing, READ ON...
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At this point, the optokinetic reflex kicks in, and moves the eye back to the point where it first saw the tree (through a saccade). Because of the smaller pupil size, older eyes receive much less light at the retina. Thus, for humans to be able to see while moving, the brain must compensate for the motion of the head by turning the eyes. The intensity of light (e. Cone cells, conversely, need high light
When, for example, looking out of the eye. Certain Diseases can come from sexually transmitted diseases such as herpes and genital warts. Blinking the eyes is, of course, also a reflex.) which lets the lens bounce back a more convex and round shape.6 minute of arc per line pair, or 1. They both contain different pigmented photoreceptor proteins. Some eyes have up to 28,000 such sensors, which are arranged
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