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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 some animals, the retina contains a reflective layer (the tapetum lucidum) which increases the amount of light each photosensitive, READ ON...
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If all three forms of cones are stimulated equally, then white is seen.When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes.
[14] The cornea and lens help to converge light rays to focus onto the retina. The retina contains the photosensitive rod and cone cells and associated neurons. This enables snails to keep out of direct sunlight. Some insect larvae, like caterpillars, have a different type of simple eye (stemmata) which gives a rough image.The visual system in the brain is too slow to process that information if the
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