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Sadeer B Hannush MD
Cornea and Refractive Surgery

400 Middletown Blvd. Suite 110
Langhorne, Philadelphia 19047
Phone: (215) 752-8564

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Laser Vision Correction


LASIK is the acronym for Laser-Assisted in Situ Keratomileusis, a procedure in which the corneal surface of the eye is precisely reshaped by an excimer laser so that light that passes through the cornea is focused directly on the retina.

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LASEK (Laser-Assisted Sub-Epithelial Keratomileusis) differs from traditional LASIK in one fundamental way. Whereas during LASIK the entire corneal epithelium is removed to provide access to the corneal stroma (where the corrections are made), in LASEK only the outermost layer of epithelium is separated from the eye with an alcoholic solution.

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Epi-LASIK, so named because the outer corneal membrane is excised with a device called an epi-keratome, follows a procedure identical to LASIK after the removal of the flap.

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The procedure for PRK (photoreflective keratectomy) is virtually identical to that for LASEK. The only difference between the two procedures is in the way in which the outermost layer of corneal epithelium is removed.

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