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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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The different forms of eyes in, for example, vertebrates and mollusks are often cited as examples of parallel evolution, despite their, READ ON...
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This placement of the eyes helps to protect them from injury. Thus, for humans to be able to see while moving, the brain must compensate for the motion of the head by turning the eyes. When an observer views an object in motion moving away or towards himself, there is no eye movement occurring as in the examples above, however the ability to discern speed and speed difference is still present; although
The differences are useful; apart from enabling sight in both dim and light conditions, humans have given them further application. Exaggerated convergence is called cross eyed viewing (focussing on the nose for example) .[6] This gradually changed as the eyespot depressed into a shallow "cup" shape, granting the ability to slightly discriminate directional brightness by using the angle at which the light hit certain cells to identify the source. The
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. The preservative in urine sample bottles (red cap) in the UK is boric acid.As an anti-bacterial compound, boric acid can also be used as an acne treatmentLatest boric acid eye dropsin pregnancy News
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