Surgery Explained: Lasik

Surgery Explained: Lasik

Surgery Explained: Lasik

Lasik (laser-in-situ keratomileusis) Gets rid of cornea tissue to cure levels of myopia (aka nearsightedness), hyperopia (farsightedness), astigmatism and presbyopia & astigmatism. Lasik uses the excimer laser to reshape the curve of the cornea by using ophthalmology instruments or forceps to get rid of refractive errors by cutting a corneal tissue flap under the surface of the cornea.

These medical instruments kinda of like the automated micro-keratome which can be used to fix optical aberrations. Wave front mapping technology is used as a guide, as light is bounced off the retina to offer an accurate, three-dimensional image of the retina. Considerations involve the following: as a patient there are limitations, the chance of disension (cornea ectasia) & the wave front sensor can have intrinsic errors.

Lasek (laser-assisted subepithelial keratectomy) brings together elements of PRK & LASIK and could have better attributes over the two. If you don't want to remove tissue with forceps, the corneal epithelium is loosened with an alcohol solution prior & set 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 but local pain and recovery are more than compared to LASIK and chance of corneal haze is larger.

CK (conductive keratoplasty) uses radio frequency controlled energy in the stroma (the third layer of the cornea). Corneal tissue is maximized in temperature, you should make 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. In "monovision", 1 eye (usually most dominant) is corrected for clear near vision and the clear distance vision. "monovision" can be achieved with contact lenses or by a corrective procedure. The brain filters out the vision from either eye that is not clear. But most everyone is capable to do this. In contrast, but just only 1 eye is fixed with CK for "mixed vision"; combined both eyes see distances together. Although only 1 eye is multi-focal, the result is the ability to see things near better. Some folks can switch to "blended vision" more better than "monovision". It is used to treat age-related hyperopia and presbyopia.

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

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