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LASIK, (also called the flap and zap procedure), is an investigational vision-correction procedure in which a thin layer of cornea that can be folded back is produced with an instrument called a microkeratome. LASIK can be used to correct nearsightedness and farsightedness, with or without astigmatism. The University of Washington employs a state-of-the-art instrument called the Hansatome microkeratome to make the flap for LASIK. Excimer laser correction is applied beneath this flap of cornea and the flap is returned to its original position after a few minutes. The advantages of LASIK include relatively rapid visual improvement and comfort. Significant complications, however, can rarely be associated with production of the flap of cornea with the microkeratome. Therefore, patients should discuss the relative benefits and risks of LASIK compared to PRK, depending on their level of nearsightedness or farsightedness, with the surgeon. Illustration by Kathryn D. Barker |
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