PRK
(PhotoRefractive Keratectomy) involves reshaping the curvature of the
cornea with an
excimer laser to correct nearsightedness or farsightedness with or without
astigmatism.
PRK was the first procedure approved by the FDA
in 1996. It is performed by
removing the surface layer of the cornea (epithelium is the “skin”
of the eye) and applying
the laser to directly to the layers beneath the surface. It is essentially
LASIK
without the creation of a LASIK
flap. PRK generally produces results similar to
LASIK
but the patient usually experiences more discomfort and has a slower
recovery of vision than in LASIK
as it takes several days for the epithelium to grow back. PRK
has been approved by the FDA to correct nearsightedness
(Myopia), farsightedness
(Hyperopia), astigmatism
(either combined with nearsightedness or farsightedness). Monovision
is also an option with PRK, for either nearsighted,
farsighted or astigmatic eyes as well as with Presbyopia,
although Monovision PRK represents an Off Label
Use of the lasers
since it is not FDA-approved.
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