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Near FarsightednessThe human eye does alot more than allowing you tosee It is very complex and has many parts and featureswhich can have defects However to understand defectsyou must first know how the eye works First light passes through the cornea which is thetransparent part of the sclera or white of the eye which iscomposed of tough fiberous tissue Behind the sclera is awatery fluid called the aqueous humor This fluid fills acresent-shaped space which with the cornea helps bendthe light toward the center of the eye Under the aqueous humor is the iris which gives theeye color The color of the iris has no effect on how yousee and is inherited through genes The iris contols howmuch light is allowed to enter your by opening upfurther when it is dark and closing up more to block outsome light when it is bright Everything that passesthrough the pupil which looks like a black dot is whatyou see Next the light passes through the lens The lensfocuses the light rays onto the retina forming an imagein reverse and upside-down Finally light-sensitivecells in the retina transmit the image via the optic nerveto the brain by electrical signals Then the brain flipsthe image so it looks right-side-up to you You can finda diagram of the above on page 3 page 1The most common visual defects are nearsightednessand farsightedness In nearsightedness also known asmyopia the eye is longer than usual This is corrected byusing a concave lens to spread the light rays just enough toincrease the eye s focal length Hyperopia also known asfarsightedness is caused by a shorter than usual eye Aconvex lens increases light bending and returns the point offocus to the retina page 2BibliographyCoon Dennis Introduction to Psychology St PaulMinnesota West Publishing Company 1989 pp 85-87 Eye Compton s Interactive Encyclopedia 1994 1995Compton s NewMedia Inc Pierenne M H Vision and the Eye London EnglandChapman and Hall Ltd 1967 pp 2-9 page 4What are
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