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Lasik Surgical Procedure

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

Lasik surgery (laser-in-situ keratomileusis) removes cornea tissue to cure levels of myopia (aka nearsightedness), hyperopia (farsightedness), astigmatism and presbyopia & 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 kinda of like the automated micro-keratome is used to ablate the stromal bed below the created hinged flap to correct optical aberrations. Wave front mapping technology is used as a guide, as light is bounced off the retina to offer a correct, three-dimensional image of the retina. You may want to reflect on: patient selection has limitations, the possibility of disension (cornea ectasia) & the wave front sensor can have intrinsic errors.

laser-assisted subepithelial keratectomy (also known as Lasek) brings together elements of LASIK & PRIK & could have better attributes over the two. Instead of removing tissue using forceps, the corneal epithelium is loosened with an alcohol solution before and 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 longer when compared to LASIK. Also the chance of corneal haze is greater.

Conductive keratoplasty (CK) uses controlled release of radio-frequency energy into the stroma (3rd layer of the cornea). Corneal tissue is increased in temperature, you should make the cornea steeper, maximizing the focusing power to treat presbyopia. It is better and safeer than LASIK, because no tissue and laser is removed. In "monovision", one 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. Possibly, but just only one eye is fixed with CK for "blended vision"; combined both eyes see distances together. Although only 1 eye is multi-focal, the result is the ability to see things near better. Most people can adjust to "blended vision" better than "monovision". It is used to cure age-related presbyopia & hyperopia.

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


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ABOUT THE AUTHOR


Searching for medical instruments like orthopedic instruments or even pessary? Then visit HNM medical online today! A "Lasik Surgery Explained" article is by Bob M.



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