photorefractive keratectomy(redirected from Laser-Assisted Sub-Epithelial Keratectomy)
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excision of a portion of the cornea; kerectomy.
photorefractive keratectomy a procedure to correct errors of refraction in the eye by using an excimer laser to remove a portion of the anterior part of the cornea, which changes the refraction by creating a new radius of curvature.
pho·to·re·frac·tive ker·a·tec·to·my (PRK),
removal of part of the cornea with a laser to change its shape, and thus to modify the refractive error of the eye (reduce its myopia, for example).
photorefractive keratectomy (PRK)
a surgical procedure in which an excimer laser is used to reshape the human cornea to improve the refractive properties of the eye and reduce or eliminate the need for eyeglasses. The excimer laser does not require that incisions be made in the cornea. Rather than cutting, the laser shaves off preprogrammed outer layers of corneal tissue. The excimer laser is programmed to emit a measured and concentrated light beam to reshape a small part of the central cornea. It allows for correction of myopia of up to -10.0 diopters. See also refractive keratotomy. Compare radial keratotomy.
photorefractive keratectomyOphthalmology A refractive surgery that corrects myopia by changing corneal conformation Results 78% vision improvement; 3-7% complications–eg, painful healing of cornea, glare. See Refractive surgery. Cf LASIK, Radial keratectomy.
pho·to·re·frac·tive ker·a·tec·to·my(PRK) (fōtō-rĕ-fraktiv keră-tektŏ-mē)
Removal of part of the cornea with a laser to change its shape, and thus to modify the refractive error of the eye (e.g., to reduce its myopia).
Photorefractive keratectomy (PRK)
A procedure that uses an excimer laser to make modifications to the cornea and permanently correct myopia.
A surgical procedure on the cornea aimed at correcting ametropia. The epithelium is completely removed over a central diameter of about 7 mm and excimer laser ablation is then carried out on the stroma. A bandage soft contact lens is usually worn afterwards for a few days while the epithelium regenerates. Complications are more common than with either LASEK or LASIK. Useful vision recovers more slowly and pain lasts longer than with the latter procedures. Syn. keratorefractive surgery; laser refractive keratoplasty (LRK); refractive keratoplasty. See corneal ectasia; radial keratotomy.