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keratoplasty in which a slice of the patient's cornea is removed, shaped to the desired curvature, and then sutured back on the remaining cornea to correct optical error.
laser-assisted in-situ keratomileusis (LASIK) keratoplasty in which the excimer laser and microkeratome are combined for vision correction; the microkeratome is used to shave a thin slice and create a hinged flap in the cornea, the flap is reflected back, the exposed cornea is reshaped by the laser, and the flap is replaced, without sutures, to heal back into position.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Farlex Partner Medical Dictionary © Farlex 2012


Laser-assisted in situ keratomileusis Ophthalmology A type of laser ocular surgery in which the cornea is flapped open and the cornea shaved to correct either near– or farsightedness Statistics 750,000 Americans were LASIK'd in 2000; 90+% of treated Pts achieve better than 20/20 vision Criteria < –12––15 diopters for nearsightedness; +4–+6 for farsightedness Complications Ocular blowout 2º to corneal perforation, flap wrinkling/misalignment, epithelial ingrowth into stroma resulting in vision defects–glare, halos, diminished contrast, ↓ light passing to the pupil, lifting of the cornea with irregular astigmatism. See Custom LASIK, Intraocular lenses. Cf INTACS, Photorefractive keratectomy, Radial keratotomy.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


Abbreviation for laser-assisted in situ keratomileusis.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Laser-assisted in-situ keratomileusis (LASIK)

Aprocedure that uses a cutting tool and a laser to modify the cornea and correct moderate to high levels of myopia.
Mentioned in: Myopia, Radial Keratotomy
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.


A surgical procedure on the cornea aimed at correcting ametropia. A suction ring is applied to the globe and an increase in intraocular pressure to approximately 65 mmHg is induced for a maximum of two minutes. During that time an automated microkeratome advances across the cornea creating a corneal flap of about 8.5 mm in diameter, which contains the epithelium, Bowman's layer and a portion of the anterior stroma. The vacuum is then switched off and the suction ring removed. The corneal flap, which is hinged on one side of the cornea, is turned round onto the conjunctiva and the exposed stroma is ablated with the excimer laser. On completion of the laser ablation, the corneal flap is repositioned and left to adhere without sutures. There are some complications associated with this procedure, but it gives rise to less postoperative pain and more rapid visual rehabilitation than other similar surgical procedures (Fig. L4). LASIK is an acronym made from the following italic letters 'laser in situ keratomileusis' or 'laser assisted intrastromal keratoplasty'. See corneal ectasia; epikeratoplasty; Intacs; keratome; keratomileusis; keratophakia; photorefractive keratectomy.
Fig. L4 LASIK procedure. A, an incision is made into the anterior part of the cornea leaving a hinge of intact margin (shown on the left). B, the corneal flap is rolled back leaving it attached at its hinge. Excimer laser ablation is performed on the expos corneaenlarge picture
Fig. L4 LASIK procedure. A, an incision is made into the anterior part of the cornea leaving a hinge of intact margin (shown on the left). B, the corneal flap is rolled back leaving it attached at its hinge. Excimer laser ablation is performed on the expos cornea
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

Patient discussion about LASIK

Q. Has anyone had a bad experience with Lasik? I am considering the procedure but am worried about the risks.

A. i know several ophthalmologist- and they all ware's like a giant experiment on people- no one really knows what will be the long reach out come of it. but then again, cellular radiation is also a world wide i stay with my glasses for now, but that's because i'm not a big risk taker.

More discussions about LASIK
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References in periodicals archive ?
"I got Contoura LASIK done here by Dr Sanjay Chaudhary himself, was very skeptical initially but 6 months later, I couldn't be happier.
I have forwarded the long article (three times as long as this column) to friends who have had Lasik (and Lasik-like) procedures.
Despite this, my astigmatism was not severe, so if I had a Lasik surgery, he said, it may 'overcorrect' my condition and I'd still end up wearing prescription eyeglasses just the same.
"The LASIK surgery was very successful for Oksana and has helped to break down some performance barriers, especially in the sport of biathlon.
The primary objective of this study is to investigate with an objective method of wavefront propagation analysis the anterior surface corneal stability following LASIK correction in hyperopic eyes ablated with a 6th-generation excimer laser technology.
From the OCT images, the retinal thickness usually increases with diffuse decreased reflectivity in patients with macular edema.[sup][10] OCT can provide repeatable measurements of the retinal and RNFL thickness.[sup][18] In patients with macular edema because of retinal blood vessel disease, we can usually find localized retinal thickening with a normal retinal pigment epithelium layer and choroidal capillary layer.[sup][19] Some researchers have found that the foveal edema and RNFL decreased after LASIK in adults.
The current literature review was planned with the intent to provide a detailed review and a useful comparison of femtosecond assisted LASIK with other conventional refractive surgical techniques.
The authors highlighted that their study was one of only a few to report the development of new symptoms after LASIK.
All participants received a complete ophthalmological examination, including best-corrected visual acuity, IOP measurement by Goldmann applanation tonometry, gonioscopy, slit lamp and fundus examinations, Schirmer test, corneal pachymetry, and tomography to rule out any LASIK contraindications.
Bahadur says it's a tremendous honor to be allowed to perform LASIK for first responders.
Methods: One hundred thirty four eyes of 67 patients who underwent LASIK guided by aspherical ablation were included in this study.
In the MMWR report, "Notes from the Field: Mycobacterium chelonae Eye Infections Associated with Humidifier Use in an Outpatient LASIK Clinic--Ohio, 2015," an error occurred on page 1177.