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Common Refractive Errors

MYOPIA-Nearsightedness
If your eye is longer than usual or the cornea and lens have too much focusing power, light rays focus in front of the retina instead of on it.This refractive error is called myopia or nearsightedness, which means you have poor distance vision.This condition affects over 25% of adults in the United States. Fig.1:Nearsighted Eye	Fig. 2
Myopia: the image is focused in front of the retina, causing distant objects to appear blurry and close objects to appear clear. (See above Fig. 1 & 2 ) HYPEROPIA-Farsightedness If your eye is shorter than usual or the cornea and lens lack the necessary focusing power, light rays focus beyond the retina.This refractive error is called hyperopia or farsightedness, which means you don't see things clearly that are close to you. A young person may be farsighted, but unaware of it because a soft lens is able to accommodate for the lack of focusing power.With age, the lens begins to harden and hyperopia becomes more apparent.
Until recently, eyeglasses and contact lenses were the only methods available to correct refractive errors.The glass or contact lens compensates for the refraction of your own lens and cornea by adding or subtracting power. Fig.3:Farsighted Eye	Fig.4
Hyperopia: the image is focused beyond the retina, causing close objects to appear blurry and images in the distance to appear clear. (See above Fig. 3 & 4 )

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