"LASEK" redirects here. For other uses, see LASEK (disambiguation).
Refractive eye surgery procrdure
Photorefractive keratectomy
Photorefractive keratectomy at U.S. Naval Medical Center San Diego.
ICD-9-CM
11
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Photorefractive keratectomy (PRK) and laser-assisted sub-epithelial keratectomy (or laser epithelial keratomileusis[1]) (LASEK) are laser eye surgery procedures intended to correct a person's vision, reducing dependency on glasses or contact lenses. LASEK and PRK permanently change the shape of the anterior central cornea using an excimer laser to ablate (remove by vaporization) a small amount of tissue from the corneal stroma at the front of the eye, just under the corneal epithelium. The outer layer of the cornea is removed prior to the ablation.
A computer system tracks the patient's eye position 60 to 4,000 times per second, depending on the specifications of the laser that is used. The computer system redirects laser pulses for precise laser placement. Most modern lasers will automatically center on the patient's visual axis and will pause if the eye moves out of range and then resume ablating at that point after the patient's eye is re-centered.
The outer layer of the cornea, or epithelium, is a soft, rapidly regrowing layer in contact with the tear film that can completely replace itself from limbal stem cells within a few days with no loss of clarity. The deeper layers of the cornea, as opposed to the outer epithelium, are laid down early in life and have very limited regenerative capacity. The deeper layers, if reshaped by a laser or cut by a microtome, will remain that way permanently with only limited healing or remodelling.
With PRK, the corneal epithelium is removed and discarded, allowing the cells to regenerate after the surgery. The procedure is distinct from LASIK (laser-assisted in-situ keratomileusis), a form of laser eye surgery where a permanent flap is created in the deeper layers of the cornea. However, PRK takes longer to heal and can, initially, cause more discomfort.
^"Laser epithelial keratomileusis (LASEK)" Accessed June 30, 2008.
and 23 Related for: Photorefractive keratectomy information
eye or which add additional refractive means inside the eye. Photorefractivekeratectomy (PRK) involves ablation of corneal tissue from the corneal surface...
LASIK is very similar to another surgical corrective procedure, photorefractivekeratectomy (PRK), and LASEK. All represent advances over radial keratotomy...
largely supplanted by newer, more accurate operations, such as photorefractivekeratectomy, LASIK, Epi-LASIK and the phakic intraocular lens. When performing...
collaboration with Theo Seiler and Srinivasan, performed the first PhotorefractiveKeratectomy (PRK), or keratomileusis in situ (without separation of corneal...
also surgical treatments for far-sightedness: Laser procedures Photorefractivekeratectomy (PRK): This is a refractive technique that is done by removal...
PRK can refer to: North Korea's ISO 3166-1 alpha-3 code Photorefractivekeratectomy, laser eye surgery Phase reversal keying, a form of phase-shift keying...
Form and Function. New York, NY: McGraw-Hill, 2012. Print. "PhotorefractiveKeratectomy (PRK) Eye Surgery" Mutti, DO (2005). "Axial Growth and Changes...
Munnerlyn, C. R.; Koons, S. J.; Marshall, J. (1988-01-01). "Photorefractivekeratectomy: a technique for laser refractive surgery". Journal of Cataract...
Lasek may refer to: LASEK or photorefractivekeratectomy, a laser eye surgery technique Lasek, Lower Silesian Voivodeship (south-west Poland) Lasek, Kuyavian-Pomeranian...
femtosecond laser uses in LASIK and other corneal surgeries, LASEK/Photorefractivekeratectomy, CK (conductive keratoplasty), and corneal inlays (Intacs) for...
which is used to correct near and far-sightedness in vision, and photorefractivekeratectomy, a procedure which permanently reshapes the cornea using an excimer...
origin due to his German-American father. Gaethje underwent a photorefractivekeratectomy in 2016 to correct his eyesight. He said, "I used to be blind...
rigidity. As a result, some forms of refractive surgery (such as photorefractivekeratectomy) can cause traditional intraocular pressure measurements to appear...
some promising results by combining collagen cross linking with photorefractivekeratectomy, or with topography-guided transepithelial surface ablation....
Pallikaris that removes corneal epithelial cells in preparation for photorefractivekeratectomy. Another development of his in 1970, was the diamond vitrectomy...
Bourne WM (2005). "Long-term corneal keratoctye deficits after photorefractivekeratectomy and laser in situ keratomileusis" (PDF). Trans Am Ophthalmol...
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