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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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Because cone cells are all that exist directly in the fovea, astronomers have to look at stars through the "corner of their eyes", READ ON...
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This results in the high visual acuity, or the high ability to distinguish between detail, of cone cells and not rods. 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. When the ciliary muscle contracts, the tension of the fibers decrease (imagine that the distance between the tip of a triangle to its base,
Take for example, when watching a plane while standing — the plane has normal visual speed. To maximise vision and light absorption, the retina is a relatively smooth (but curved) layer.In most vertebrates and some molluscs, the eye works by allowing light to enter it and project onto a light-sensitive panel of cells known as the retina at the rear of the eye, helps maintain the shape of the eye are no
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