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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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Compound eyes are very sensitive to motion.[2][3][4] The majority of the advancements in early eyes are believed to have taken only, READ ON...
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[20] Thus, the eye can be considered as undergoing rotations about a single point in the center of the eye. 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.6 minute of arc per line pair, or 1. The different forms of eyes in, for example, vertebrates and mollusks are often cited as examples of parallel evolution, despite their distant common ancestry. The opsin in both
The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells. Take for example, when watching a plane while standing — the plane has normal visual speed.Rapid eye movement, or REM for short, typically refers to the stage during sleep during which the most vivid dreams occur. This light causes chemical changes in the photosensitive cells of the retina, the fovea
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