Near & Farsightedness, 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 …

…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. page 2 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. 2-9.