What Are Visual Defects And How Common Are They ?
?
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 fiberous tissue.
Behind the sclera is a watery fluid called the aqueous humor. This fluid fills
a cresent-shaped space which with the cornea helps bend the light toward the
center of the eye.
Under the aqueous humor is the iris which gives the eye color. The
color of the iris has no effect on how you see and is inherited through genes.
The iris contols how ...
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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 lens increases light bending and
returns the point of focus to the retina.
Bibliography
Coon, Dennis, Introduction to Psychology, St. Paul, Minnesota, West Publishing
Company, 1989, pp. 85-87.
"Eye," Compton's Interactive Encyclopedia, 1994, 1995 Compton's NewMedia, Inc.
Pierenne, M. H., Vision and the Eye, London, England, Chapman and Hall Ltd., 1967,
pp. ...
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What Are Visual Defects And How Common Are They ?. (2006, July 25). Retrieved November 28, 2024, from http://www.essayworld.com/essays/What-Visual-Defects-How-Common-They/49683
"What Are Visual Defects And How Common Are They ?." Essayworld.com. Essayworld.com, 25 Jul. 2006. Web. 28 Nov. 2024. <http://www.essayworld.com/essays/What-Visual-Defects-How-Common-They/49683>
"What Are Visual Defects And How Common Are They ?." Essayworld.com. July 25, 2006. Accessed November 28, 2024. http://www.essayworld.com/essays/What-Visual-Defects-How-Common-They/49683.
"What Are Visual Defects And How Common Are They ?." Essayworld.com. July 25, 2006. Accessed November 28, 2024. http://www.essayworld.com/essays/What-Visual-Defects-How-Common-They/49683.
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