What is prk

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PRK (photorefractive keratectomy) used to be the most common refractive surgery procedure. It is now known as LASIK. ChaCha! [ Source: http://www.chacha.com/question/what-is-prk ]
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What is PRK? PRK or photo refractive keratectomy, is laser surgery to correct nearsightedness (myopia), farsightedness (hyperopia) and astigmatism.
Some patients who are not good candidates for LASIK may have excellent results with another procedure known as PRK. PRK, or photorefractive keratectomy, is a procedure to correct nearsightedness, farsightedness and astigmatism. Rather than …
Photorefractive keratectomy (PRK) uses the excimer laser to remove microscopic amounts of corneal tissue on the front of the corneal surface to correct nearsightedness, farsightedness and astigmatism. PRK is an outpatient treatment which ta…

Related Questions Answered on Y!Answers

What is the enlistment process for joining the Navy Special OPs and getting the needed PRK?
Q: Asked quite a few people and even a recruiter and couldn’t get a definite answer. What are the correct steps to follow to ensure that I am allowed PRK and entry into Special OPs?
A: You can join under contract to be given a slot in BUD/s. This by no means says you will be a SEAL. They’ll simply give you a chance to try. Ask a recruiter about the “SEAL Challenge.” A lot of people may try to discourage you, but if it’s what you want to do, go for it. Find out for yourself. Note, if you fail out, you may end up chipping paint on some grey boat for the next four years. That may be motivation enough to stick it out. 😉
What is the difference between Lasik and PRK?
Q: I was informed all about Lasik but once it came down to it the doctor said I could only have PRK laser surgery and not Lasik. I don’t know much about PRK.. I mean I know it takes longer to heal and I basically know the procedure.. but I wasn’t informed of the side affects it may have and I can’t seem to find the information I need online. Has anyone had this surgery? WHta were your results and did it hurt? I need as much information as possible please before I make a decision. I will be calling the doctor tomorrow, but I would rather hear about it from people who have actually had it done. Thanks in advance.
A: The technical difference between Lasik and PRK is where the laser ablates (removes) corneal tissue. The patient difference is speed of vision recovery and discomfort.When the excimer laser was first developed, all laser assisted surgery to reduce the need for corrective lenses was Photorefractive Keratectomy (PRK). The process of PRK is to remove the outermost layer of soft cells on the cornea (epithelium), reshape the surface of the cornea with the laser, and then wait for the epithelial cells to regenerate and cover the treatment area. Corneal epithelial cells are the fastest reproducing cells in the human body.Early PRK was quite successful and a significant improvement over previous techniques, but it had some problems. Removal of epithelial cells causes a wound response that includes major discomfort and corneal haze if the laser needed to remove a lot of tissue to correct very bad eyesight.A very clever eye surgeon realized that if the laser sculpting was done under a flap of corneal tissue and not at the surface, then the wound response would be different. Lasik is actually the combination of two surgical procedures. The first step of Lasik is to create a flap of corneal tissue and move it aside. The second step is to use an excimer laser to reshape the cornea. After ablation, the Lasik flap is repositioned over the treatment area. Lasik “fools” the eye into not knowing it has had surgery, so the wound response is muted. This is why Lasik can have almost instant vision recovery, virtually no pain, and virtually no chance of corneal haze.There are a few important limitations to Lasik. One is corneal thickness. At least 250 microns of corneal tissue must remain untouched for a healthy eye to remain stable. The Lasik flap is about 100-160 microns thick, so the laser sculpting is starting that much deeper. Some people don’t have corneas thick enough to accommodate the Lasik flap.The other problem with Lasik is the flap itself. Although Lasik flap related complications are relatively rare, they do occur. No Lasik flap means no possibility of a Lasik flap complication. No possibility is always better than a low probability.Lasers and surgical techniques have improved over the past decade and the lasers are able to create very nuanced sculpting. Placing 100-160 microns of Lasik flap over a nuanced laser ablation loses some of the nuance. For these reasons, many doctors are returning to PRK as their primary choice for laser eye surgery.Newer lasers and operative techniques have all but eliminated the chance of corneal haze with PRK.In the long-term, the results from PRK will likely be equal to or slightly better than Lasik. In the short term you may experience discomfort and vision recovery will slower than Lasik. With PRK you can expect to have very poor vision for 1-3 days, “functional fuzzy” vision for about a week, and then vision quality will improve over the next few weeks and months.
Is it worth getting PRK surgery to correct my vision?
Q: I am thinking of getting PRK surgery. What are some experiences or advice on this procedure?
A: PRK is an excellent procedure for the right corrections.Below are two sites that discuss it.
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