Lasik Surgery Process

Lasik surgery (laser-in-situ keratomileusis) removes cornea tissue to heal levels of myopia (aka nearsightedness), farsightedness (hyperopia), presbyopia and astigmatism. The way the lasik works is by having a laser to reshape the curvature of your cornea after your specialist cuts your outer-thin layer of your eyeball by using forceps or in rare cases orthopedic instruments.

Such surgical instruments sort of like the automated micro-keratome which can be used to correct optical aberrations. Acting as a guide, wave front mapping technology is used as light is bouncing off the retina to give the specialist a three dimensions view of the retina. Considerations include the following: patient selection has its limits, the possibility of disension (cornea ectasia) and the wave front sensor may have intrinsic errors.

laser-assisted subepithelial keratectomy (also known as Lasek) brings together elements of PRK & LASIK & could have better attributes over the 2. Instead of removing tissue using forceps, the corneal epithelium is loosened with an alcohol solution prior & moved aside. The surface under the epithelial layer is ablated by laser (photoablation) which is a certain kind of surgical tools and the epithelium is returned to the original position. When you compare it to the corneal ectasia it is reduced however local pain & recovery usually can be more when compared to LASIK. Also the chance of corneal haze is greater.

CK (conductive keratoplasty) uses radio frequency controlled energy in the stroma (the 3 layer of the cornea). The heat of the corneal tissue is increased, making the cornea steeper, this focuses the focusing power to threa the presbyopia. It is better than LASIK because no laser is used and no tissue is removed. with "monovision", one eye (usually most dominant) is corrected for clear distance vision and the other for clear near vision. "monovision" can be done by corrective procedure and contact lenses. the brain will naturally filter out the sight from each eye thats not clear. But most everyone is capable to do this. Possibly, only one eye is fixed with CK for "mixed vision"; combined both eyes see distances together. Although only one eye is multi-focal, the conclusion is the ability to see things near better. Most folks can adjust to "blended vision" better than "monovision". It can be used to treat age-related presbyopia & hyperopia.

LTK (Laser Thermal Keratoplasty) is done with a noncontact laser to change the shape of the cornea, make it more steep. The more steep the curve; the better the corneas focusing power; views & images are made into much better focus on the retina. LTK can reduce or eliminate hyperopia.



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This "Surgery Explained: Lasik" editorial is by Rich A.