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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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This is why the darker conditions become, the less color objects seem to have. Take for example, when watching a plane while standing, READ ON...
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Human eyes respond to light with wavelength in the range of approximately 400 to 700 nm. The narrow beam of sharp vision is easy to test by putting a fingertip on a newspaper and trying to read the text while staring at the fingertip — it is very difficult to read text that's just some centimeters away from the fingertip. Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry
day) plays a major role in determining speed and speed difference. For example, birds of prey have much greater visual acuity than humans, and some can see ultraviolet light. The optic disc, sometimes referred to as the anatomical blind spot, is a point on the retina where the optic nerve pierces the retina to connect to the nerve cells on its
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