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What Are Visual Defects And How Common Are They ?
Beginning of paper
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The human eye does alot more than allowing you to see. It is very
complex and has many parts and features which can have defects. However, to
understand defects you must first know how the eye works.
First light passes through the cornea, which is the transparent part of
the sclera, or white of the eye, which is composed of tough fi .... Middle of paper
.... the image so it looks right-
side-up to you. You can find a diagram of the above on page 3.
The most common visual defects are nearsightedness and farsightedness.
In nearsightedness, also known as myopia, the eye is longer than usual. This is
corrected by using a concave lens to spread the light rays just enough to
increase the eye's focal length. Hyperopia, also known as farsightedness, is
caused by a shorter than usual eye. A convex l ....
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Number of words: 344
Number of pages: 2 (approx. 250 words per double-spaced page)
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