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LASIK or Lasik (/ ˈ l eɪ s ɪ k /; "laser-assisted in situ keratomileusis"), commonly referred to as laser eye surgery or laser vision correction, is a type of refractive surgery for the correction of myopia, hyperopia, and astigmatism. [1]
Epi-LASIK: Epi-LASIK is also used to correct hyperopia. [22] In this procedure, use of epikeratome eliminates the use of alcohol. [22] Laser thermal keratoplasty (LTK): Laser thermal keratoplasty is a laser based non-destructive refractive procedure used to correct hyperopia and presbyopia. [22] It uses Thallium-Holmium-Chromium (THC): YAG ...
Recovery time is longer with PRK than with LASIK, though the outcome (after 3 months) is about the same (very good). More recently, customized ablation has been performed with LASIK, LASEK, and PRK. Transepithelial photorefractive keratectomy (TransPRK) is a laser-assisted eye surgery to correct refraction errors of human eye corneas. It uses ...
Sphere: This number denotes the strength of the lens needed to correct your vision. A "–" indicates nearsightedness while a "+" indicates farsightedness. Higher numbers indicate more power in either direction. Cylinder: This number denotes the amount of astigmatism, if any.
It is a type of refractive error, along with nearsightedness, farsightedness, and astigmatism. [4] Diagnosis is by an eye examination. [4] Presbyopia can be corrected using glasses, contact lenses, multifocal intraocular lenses, or LASIK (PresbyLASIK) surgery. [2] [7] [4] The most common treatment is glass correction using appropriate convex lens.
The procedure can be used to treat astigmatism, nearsightedness, and farsightedness. [3] During the procedure, the epithelium is displaced using a diluted alcohol solution. [4] PRK has advantages over LASIK in that it avoids added complications associated with the flap created during surgery.