About Lasik
LASIK (Laser in-situ Keratomileusis) is used to correct or reduce moderate to high levels of nearsightedness (myopia), astigmatism and farsightedness (hyperopia). The traditional LASIK procedure is relatively simple: a keratome is used to gently create a flap in the cornea. In IntraLASIK the flap is created by a computer-controlled, precision laser. The flap is lifted and an excimer laser is then used to shape the remaining tissue. The flap is then carefully set back into place, forming an occlusive seal by osmopic pressure. Osmopic pressure holds the flap in place and allows it to heal very quickly, without stitches!
Studies have shown that the LASIK procedure causes the least amount of discomfort when compared to all other types of refractive surgeries. Patients have also reported an almost immediate improvement in their vision following the LASIK procedure. Most patients say they experience little or no discomfort during or after the procedure.
Nearsightedness - Myopia
Nearsightedness is an optical error that blurs the distance vision. Light coming into the eye is improperly focused in front of the retina, instead of directly on the retina because the cornea is steep. To treat nearsightedness with the LASIK procedure, the cornea must be made flatter. This is accomplished by narrowing the laser field and removing tissue from the center of the cornea.
Farsightedness - Hyperopia
Farsightedness is an optical error of the eye that blurs near vision and may also blur the distance vision. Because the cornea is flat, light coming into the eye is improperly focused behind the retina. To treat farsightedness with the LASIK procedure, the central cornea must be made steeper. This is accomplished by directing the laser beam to affect a wider field which removes tissue from the corneal edge while leaving the center unaffected.
Astigmatism
Astigmatism is an optical error of the eye that can blur vision at all distances. The oblong or football shape of the cornea creates different focus points rather than one single sharp focus. To treat astigmatism with the LASIK procedure, the cornea must be made more spherical. By changing the pattern of the beam, tissue is removed in one area more than the other. At the same time, if the cornea is being treated for nearsightedness or farsightedness, the computer that guides the laser also corrects those conditions in addition to the astigmatism.