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The cornea and lens combine to focus visual images on the back of
the eye. When the overall
shape of the eye is incorrect or when the curvature of the cornea
is incorrect, the visual images are not in focus. The cornea accounts
for approximately 2/3rds of the focusing power of the eye. By surgically
changing the corneal curvature, most or all of the blur can be eliminated.
Laser In Situ Keratomileusis (LASIK) and Photo-Refractive Keratectomy (PRK) are two surgical techniques which utilize lasers to reshape or change the curvature of the cornea.
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Reprinted with Permission of Einstein Medical, Inc. Copyright (c) 2000
