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The Function of the Eye
Clear vision results when light enters the eye along the correct path and projects a sharp image on the retina. If this does not happen, a person will have blurry vision.
Poor vision has many causes. For example, the cornea may be too round or flat for the length of the eye. Light is then projected behind or in front of the retina rather than on it. This can cause a number of vision aberrations, such as nearsightedness, farsightedness, or astigmatism.
Aberrations of the Eye
Nearsightedness
Farsightedness
Astigmatism
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