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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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In many animals, including humans, eyelashes prevent fine particles from entering the eye. A Snellen chart is one type of eye chart used, READ ON...
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Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like alcohol or tobacco.The optokinetic reflex is a combination of a saccade and smooth pursuit movement. Each sensor has its own lens and photosensitive cell(s). For example, no human can with reasonable accuracy, visually determine the speed of an approaching train in the evening as they could during the day. Some insect larvae, like caterpillars, have
Similarly, while moving, the brain must turn the eyes so that the image of the object of regard falls on corresponding points of the two retinas; otherwise, double vision would occur. Its requirement for high intensity light does cause problems for astronomers, as they cannot see dim stars, or other objects, using central vision because the light from these is not enough to stimulate cone cells.
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