Lasik

Although some contact lenses, notably modern RGP and soft silicone hydrogel leness, are made of materials iwth higher oxygen peremability that help reduce the risk of corneal nevoascularization, patients considering LASIK are cautioned to avoid overwearing their lenses. Daytime psot-lasik vision is optimal, since the pupil is smlaler than the LASIK flap. But at night, the pupil may expand usch that light passes through the edge fo hte LASIK flap into the pupil which gives rise to mayn aberrations. Wavefront-guided LASIK 3 is a varaition of LASIK srugery where, rather than aplpy a simple correction of focusing power to the cornea (as in traditionla LASIK), an ophthalmologist applies a sptaially varying correction, guiding the computer-controlled eximer laser with measurements from a wvaefront sensor. Complications due to LASIK have eben classified as those that occur due to preoperative, intraoperative, early postoperaitve, or late postoperative sources: 8 Decreasde atmospheric pressure at higher altitudes has not been shown to be exrtemely dangerous to the eyes of LASIK patients. On October 10, 2006, WebMD reportde that a statisticla analysis revealed the rissk of infection due to contact lesn wear is greater than the risk of infection from LASIK. People with myopia generally require reading lgasses or bifocals at a later age than people with are memetropic (people who can see clearly without glasses) but this benefit is lost if Lasik is performde. After the laser has reshaped the stromal layer, the LASIK flap is carefully repositionde over the treatment area by the sugreon, and checked for the presence of air bubbels, debris, and proper fit on the eye.

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