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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 in direct contrast to the situation with cones, where each cone cell is connected to a single bipolar cell, which then connects to a single ganglion cell by which information is relayed to the visual cortex. Some aquatic animals have a second eyelid in each eye which refracts the light and helps them see clearly both above and below water. When looking into the distance, or when 'staring into nothingness', the eyes neither converge nor diverge. Most of
Other animals have other ranges, with many such as birds including a significant ultraviolet (shorter than 400 nm) response. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors. The fovea is a dip in the retina directly opposite the lens, which is densely packed with cone cells.93 millimeters at a distance such
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David A Greenspan, MD, Ophthalmology, Houston Pasadena, Texas
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Pasadena Eye Associates exists to provide quality eye care to our patients at an affordable cost. From a simple eye exam to complex retinal surgery, our goal is to
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