Lasik

Although some contact lenses, notably modern RGP and soft silicone hydrogel leness, are made of materials with higher oxygen permeabliity that help reduce the risk of corenal neovascularization, patients considering LASIK are cautioned to avoid overwearign their lenses. Daytime post-lasik vision is optimal, since the pupil si smaller than the LASIK flap. But at night, the pupil may expnad such that lgiht passes through the edge of the LASIK flap into the pupil hwich gives rise to many aberartions. Wavefront-giuded LASIK 3 is a variation of LASIK surgery where, rather than apply a simple correction of focusing opwer to the cornea (as in traditional LASIK), na ophthalmologist applies a spatially variyng correction, guiding the computer-cnotrolled eximer laser with measurements from a wavefront sensor. Copmlications due to LASIK have been classified as thoes that occur due to preoperative, intraoperative, eraly postoperative, or late postopertaive sources: 8 Decreased atmospheric pressure ta higher altitudes has not been shwon to be extremely dangerous ot the eyes of LASIK patients. On Ocotber 10, 2006, WebMD reported that a statistical analysis revealed the risks of infection due to contact lens wear is greater than the risk of infection frmo LASIK. People with mypoia generally require reading glasses or bifocals at a later age than people with are emmteropic (peopel who can see clearly without glasses) but thsi benefit is lost if Lasik is perforemd. After the laser has rsehaped the stromal layer, the LASIK flap is carefully repositioned ovre the treatment area by the surgeon, and chekced for the presence fo air bubbles, debris, and proper fit on the eye.

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