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Topic: PRK

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	LaserMyEye :: Encyclopedia :: Photorefractive keratectomy (PRK)
		In PRK, the epithelium (outer "skin" of the cornea) is manually removed and an excimer laser is applied to the exposed stroma underneath.
		PRK carries the risk of haze (scarring on the cornea), particularly with higher amounts of correction.
		Additionally, PRK does not penetrate so deeply into the cornea, so there is far less risk of ectasia.
	www.lasermyeye.org /encyclopedia/prk.html (247 words)

	Laser Eye Surgery - PRK & LASIK Glossary & Definitions
		A complication of PRK where the laser beam fails to remove a portion of cornea- usually in the center of the area to be removed.
		Masks are used in PRK surgery to modify the removal of surface tissue by the laser.
		PRK surgery involves the removal of or fashioning of concave (myopic) or convex (hyperopic) lenses on the corneal surface.
	www.prk.com /PRK_Glossary.html (2326 words)

	Executive Summary
		PRK is a procedure that is gaining acceptance in the civilian population.
		Concerning the efficacy of PRK, the wound-healing responses in animal studies from rabbits and primates indicate that the PRK wounds heal predominantly by corneal fibrosis during the first 6 months after surgery.
		We strongly recommend that any future PRK studies evaluate visual function using measures other than high-contrast letter acuity when assessing the suitability of PRK for the military and that those measures be tailored to the specific military task in question.
	www-staff.lboro.ac.uk /~huph/PRKvision.htm (3638 words)

	PRK and epi-LASEK
		PRK, or photorefractive keratectomy is a laser technique that treats the middle layers of the cornea to correct hyperopia (farsightedness), myopia (nearsightedness) and astigmatism.
		The purpose of PRK is to reshape the cornea to help the eye to focus at far distances, reducing, or in some cases eliminating, the need for glasses or contact lenses.
		Although PRK has fallen out of favor over the past few years because LASIK is so much more convenient for the patient in the early post-operative period, PRK is gaining in popularity now with the advent of the larger optical zone lasers capable of performing laser treatments in patients with pupils up to 9mm.
	www.westtexaseye.com /prk.htm (1515 words)

	Moorfields Eye Hospital NHS Trust : PRK (Site not responding. Last check: 2007-10-21)
		PRK is surface laser reshaping without a corneal flap.
		PRK is easy to perform but the recovery period is longer than for LASIK because the surface tissues need time to heal after treatment.
		PRK may be safer than LASIK if you have low to moderate myopia (less than –6.00D) and the cornea is relatively thin but otherwise normal.
	www.moorfields.org.uk /PrivatePatients/RefractiveLasersurgery/PRK (462 words)

	NIDEK - Excimer Laser System EC-5000CX Series
		In PRK of moderate myopia with astigmatism, due to cylinder coupling effects on sphere, the lower range of the intended use must be restricted in a step-wise fashion, with a nomogram lookup table provided for specific treatment combinations.
		In PRK for moderate myopia with astigmatism studies of 635 eyes with refractive data at 6 months of follow-up, 93.5% were corrected to 20/40 or better and 64.3% were corrected to 20/20 or better without spectacles or contact lenses.
		PRK and LASIK are contraindicated in patients with autoimmune, immunodeficiency, or collagen vascular disease, signs of keratoconus, susceptibility to excessive keloid formation, or who are pregnant or nursing, or on certain ocular or systemic steriod regimens.
	www.nidek.com /ec5000.html (1003 words)

	eMedicine - Astigmatism, PRK : Article by Manolette R Roque, MD (Site not responding. Last check: 2007-10-21)
		PRK is the application of ultraviolet high-energy photons (193-nm wavelength) of the ultraviolet range generated by an argon fluoride excimer laser to the anterior corneal stroma to change its curvature and, thus, to correct a refractive error.
		PRK is contraindicated in patients with collagen vascular, autoimmune, or immunodeficiency diseases; those with signs of keratoconus; patients taking isotretinoin or amiodarone hydrochloride; or those who are pregnant or breastfeeding.
		PRK is not recommended in patients with a history of ophthalmic herpes simplex or herpes zoster.
	www.emedicine.com /oph/topic657.htm (8120 words)

	LASIK and PRK - Huntington Eye Care Associates, Paul L. Krawitz, M.D. (Site not responding. Last check: 2007-10-21)
		In PRK (photorefractive keratectomy), the Excimer layer is used exclusively to reshape the cornea.
		Although the PRK procedure itself is painless, patients may experience blurry or hazy vision for one to five days afterward and variable discomfort until the epithelium heals and covers the treated area.
		PRK is most often used to treat low to moderate amounts of nearsightedness, farsightedness and astigmatism.
	www.eye-surgeons.net /lasik.htm (452 words)

	PRK (Site not responding. Last check: 2007-10-21)
		In October 1995, the FDA approved the use of the excimer laser (PRK) for the correction of myopia between -1.00 and -7.00 of myopia.
		With PRK, like all surgical procedures, there is a small risk that a complication or problem could develop, either at the time of surgery or afterwards.
		PRK is approved in the United States for the treatment of -1.00 to -7.00 diopters of myopia.
	www.bgsm.edu /eye/cornea/prk1.htm (983 words)

	3-98 Point-Counterpoint
		The results of the modern PRK technique we use are excellent in all ranges of myopia, especially when used on myopes under 6 D, the population that makes up the bulk of any refractive surgery practice.
		Far from deceased, PRK is a time-proven procedure that provides excellent outcomes with a minimum of complications for the patient, or surgical difficulty for the ophthalmologist.
		Even though corneas which have undergone PRK re-epithelialize in a few days, the restructured epithelium is initially irregular on the surface, leaving patients with limited quality of vision during the initial post-op period.
	www.revophth.com /1998/398F9.htm (1882 words)

	LASIK/PRK FAQs
		PRK is a surgical procedure using an excimer laser to reshape the cornea.
		The goal of LASIK or PRK is to reduce or eliminate your dependence on contact lenses or glasses.
		PRK: Patients may experience a gritty sensation with some light sensitivity and tearing for approximately 3 to 5 days.
	www.midwesteyecare.com /lasikfaqs.htm (563 words)

	Maddox Laser Eye Center - PRK Brochure
		Excimer Laser PRK for myopia, hyperopia, or astigmatism alone generally is not able to give both near and distance vision without glasses to those patients in the over-40 age group, unless one is corrected for blended vision - i.e., one eye corrected for distance and the other eye corrected for near vision.
		PRK At this time, for the excimer correction of myopia, specific variables such as intraocular pressure, thickness of the cornea, keratometry readings (flat or steep), scleral rigidity, etc. do not indicate that they would directly affect the surgical outcome.
		PRK Best corrected vision: Most of the time, best corrected vision is attained by 3 months, but it can take as little as 1 week or as long as 6 months or longer to attain best corrected vision.
	www.excimernet.com /MPRKfull.htm (16276 words)

	Dr. Cornell's Better Vision Web Site - Laser Vision Correction FAQ (Site not responding. Last check: 2007-10-21)
		Both PRK and LASIK use an excimer laser to change the shape of the cornea, the front surface layer of the eye.
		PRK is the original procedure of using the excimer laser to reshape the surface layer of the cornea.
		PRK has a ten year history and is very stable and predictable.
	www.cornell-eye.com /faq.html (4240 words)

	Laser Eye Center of Lubbock - Laser Eye Surgery (LASIK, PRK) - Lubbock, Texas
		While LASIK and PRK, or photorefractive keratectomy both use the excimer laser to provide the eye’s correction, LASIK is preferable with regard to the speed and comfort of visual recovery and, in very nearsighted patients, the results and risks.
		The procedure is somewhat longer than for PRK, because the surgeon needs to be absolutely meticulous about the creation of the flap and the placement of the flap after lasering.
		Since none of the surface tissues of the eye are removed in LASIK (as opposed to PRK), the eye remains protected by its natural epithelial barrier.
	www.laserlubbock.com /lasik.htm (1354 words)

	Laser Eye Surgery, PRK, LASIK at the Cornea and Laser Eye Institute (Site not responding. Last check: 2007-10-21)
		Total time for the PRK procedure from insertion to removal of the lid speculum was 7 minutes or less in 172 eyes (28%), 7 to 10 minutes in 176 (29%), 10 to 13 minutes in 135 (22%), and over 13 minutes in 123 eyes (20%).
		Wound remodelling in PRK, in contrast, may exert diminishing effects with time and fewer late changes on the corneal curvature since the refractive change of PRK is mediated by a direct effect on corneal curvature rather than by biomechanical manipulation as in RK.
		Refraction after PRK stabilizes progressively and stability is achieved in most eyes between 1 and 2 years without evidence of progressive or late myopic or hyperopic refractive shifts.
	www.drhersh.com /director/article-phase3.html (8070 words)

	PRK eye surgery information - laser vision correction
		Photorefractive keratectomy (PRK) is a type of refractive surgery used to correct myopia (nearsightedness), hyperopia (farsightedness), and astigmatism.
		PRK is a good form of vision correction for patients with stable vision and low to moderate refractive errors.
		PRK has also been used to treat farsightedness by removing tissue from the periphery of the cornea to steepen its curvature.
	www.yourhealthfyi.com /prk.html (548 words)

	Laser Eye Surgery - Vision correction with LASIK & PRK
		LASIK combines the precision of the excimer laser that is used in PRK surgeries with the flap technique that characterizes ALK.
		PRK, or photorefractive keratectomy, is similar to LASIK in that both procedures employ a computer-controlled excimer laser to reshape the cornea, the front surface of the eye, in order to
		PRK is characterized by a lengthier healing process and more discomfort than LASIK.
	www.lasersurgery4eyes.com /lasereyesurgery/lasikvisioncorrection/lasikprklasereyesurgery.html (289 words)

	PRK Laser Eye Surgery - How PRK Works; What to Expect From PRK - AllAboutVision.com
		The first FDA approval of a laser for PRK was in 1995, but the procedure was practiced in other countries for years.
		PRK is performed with an excimer laser, which uses a cool ultraviolet light beam to precisely remove ("ablate") very tiny bits of tissue from the surface of the cornea in order to reshape it.
		PRK is an ambulatory procedure; you walk into the surgery center, have PRK, and walk out again.
	www.allaboutvision.com /visionsurgery/prk.htm (634 words)

	Laser Vision Correction, LASIK and PRK (Site not responding. Last check: 2007-10-21)
		There are two popular forms of the procedure: PRK (photorefractive keratectomy) and LASIK (laser-assisted in-situ keratomileusis).
		In PRK, the surgeon removes a thin layer from the front of your cornea.
		PRK patients usually return to work after a couple of days.
	www.peninsulaeye.com /faq.html (562 words)

	PRK vision correction procedure
		The PRK procedure, when used to treat myopia, flattens the central cornea so that light is better focused upon the retina.
		Hyperopic PRK is performed by using the laser to treat or flatten the peripheral cornea and thus "steepen" the central cornea relative to its periphery.
		Despite the fact that PRK is extremely accurate, it is still a surgical procedure whose outcomes can only be predicted in statistical terms.
	www.cherrycreekeye.com /PRK.html (431 words)

	John Cooper's Web Site - PRK & LASIK Page (Site not responding. Last check: 2007-10-21)
		I have had both PRK and LASIK performed on both of my eyes and I hope that my experiences will be helpful to anyone who is considering having either procedure performed.
		PRK Surgery: My surgery day was Friday, probably the most common day of the week for it.
		My PRK was performed with the Summit, and that had two important effects on my results: first, the Summit can not fix astigmatism, and second, the Summit only has a 6mm laser spot.
	www.jrcooper.com /prklasik.htm (1836 words)

	Laser Vision Correction (LASIK)
		This procedure is very similar to PRK, except the top layer of the cornea is modified with a microkeratome, a highly sophisticated motorized device, which is applied to the cornea with suction under pressure.
		The advantages over PRK is that vision returns quicker, there is less discomfort, it can correct higher degrees of nearsightedness and there is less chance of scarring.
		We recommend all myopic patients considering PRK or LASIK undergo screening with corneal topography to rule out early forms of keratoconus, since they may be unhappy with the outcomes of their surgery if these conditions go undetected.
	www.laser-prk.com /surgery.htm (2762 words)

	Laser Vision Correction FAQs: LASIK and PRK - AllAboutVision.com
		It is a surgical procedure that uses a cool (non-thermal) beam of light to gently reshape the cornea —; the surface of the eye — to improve vision.
		Although no one knows the exact number of complications, studies suggest that the incidence of minor difficulties such as dry eyes and nighttime glare is around 3% to 5%, while the risk of serious incidents such as lost vision is thought to be less than 1%.
		PRK generally has been more painful afterward because the procedure exposes the deeper layers of the cornea.
	www.allaboutvision.com /faq/lasik_prk.htm (1305 words)

	LASIK - PRK - Laser Eye Surgery - Laser Vision Correction - Lasik Eye Surgery - Orange County
		PRK is used to treat low to moderate amounts of nearsightedness, astigmatism, and farsightedness.
		At the same time, the post-operative discomfort associated with PRK is minimized.
		PTK or photo-therapeutic keratectomy is not strictly a refractive procedure but it is performed with the same excimer laser used for LASIK, PRK, and LASEK.
	www.southcoasteye.com /lasereyesurgery.html (882 words)

	LASIK PRK laser eye surgery (Site not responding. Last check: 2007-10-21)
		With prk, more discomfort may occur after the eye surgery and may require longer healing time than lasik.
		In PRK, instead of using a diamond-bladed instrument to make incisions in the cornea —; as in RK — the surgeon uses a laser to reshape the cornea.
		Although PRK is still often used to correct mild nearsightedness, the drawback of PRK is that the outer part of the cornea, called the epithelium, is removed while performing the procedure.
	www.noglasses.com /prk.html (176 words)

	Slingsby & Wright Eye Care \| Eye Care is Our Care
		PRK differs from LASIK in that no flap is created before applying the laser.
		The surface cells of the cornea (epithelium) are removed prior to the laser reshaping the cornea.
		There is more discomfort with PRK due to the longer healing time.
	www.yourvisioncare.net /prk.html (248 words)

	LASIK or LASEK?
		Essentially, the 2 operations achieve the same results and cover the same range of prescriptions (+4 to -11 approx.) However, LASIK is a nicer surgical experience for the patient as there is quick visual recovery and no pain apart from a little grittiness.
		Pain is a lot less than it used to be with PRK because of the epiflap technique, silicone contact lenses post op, diluted anaesthetic drops and better oral medication.
		LASEK/ PRK are back to the baseline pre-operative values by 1 month post-op, whereas with LASIK this normally takes up to 3 months and occasionally longer.
	www.birkacre.freeserve.co.uk /new_page_6.htm (939 words)

	Eye Care Associates of St.Louis, LLC._Refractive_Surgery
		PRK is a type of refractive surgery that uses the excimer laser to re-sculpt the cornea, thereby reducing or eliminating the need for corrective lenses.
		With PRK, a pulsed beam of ultraviolet light removes an exact amount of tissue from the surface of the cornea, flattening or steepening its center and changing the way the light is focused on the retina.
		PRK has been approved by the FDA for a wide range of myopia, hyperopia, and astigmatism.
	www.eyecarestl.com /refractive_surgery.html (1639 words)

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