PRK (Photo-refractive Keratotomy)
Similar to LASIK, both of these eye surgery techniques are referred to as refractive surgery. PRK was the first laser refractive surgery approved by the FDA receiving final approval in 1995. PRK is a safe refractive procedure that utilizes the excimer laser to reshape the cornea and improve nearsightedness, farsightedness, and astigmatism. The amount of tissue reshaped depends on the severity of the prescription. In most cases, 5 to 10 percent of the cornea is removed. Once the cornea has flattened, light rays are more easily focused upon the retina. PRK differs from LASIK in that no flap of tissue is created prior to resculpting the cornea with the excimer laser. In LASIK this flap creation does enable a faster recovery period and less post-operative pain.
The procedure can be performed once the eye has been numbed with anesthetic drops. A speculum will be positioned to hold your eyelids back just like in LASIK so that you eyelids will not interrupt the actual surgery. The ophthalmologist will then remove the outer cornea cells and proceed with the actual laser treatment. The laser delivery takes less than one minute to complete for most patients. Once the laser treatment or refractive ablation is completed, the corneal curvature is reshaped, thus improving the refractive error. Your ophthalmologist will then place a bandage contact lens on the eye for improved comfort along with anti-inflammatory and antibiotic eye drops.
PRK is a safe, effective alternative to LASIK for many potential refractive surgery patients. PRK results are very similar to LASIK results. In general, PRK patients will have a somewhat slower recovery period. You may have pain that varies in intensity for up to three days. Appropriate pain medication is provided. PRK is offered to those patients whose refractive error is too high for LASIK, or for those patients whose corneas are too thin for LASIK. Please feel free to contact our staff to better understand the advantages of PRK and whether or not this would be a good option for your vision correction.
Post-operatively, most patients will need to be re-evaluated one day, three days, one week, one month, two to three months, and four to six months following the PRK procedure. The bandage contact lens can usually be removed on the second or third post-operative day when the epithelium is healed. Most patients will only require eye drops to control healing during the first 6 to 12 weeks, but other patients may require topically applied medications for up to 6 months or more following the procedure. In general, the greater the refractive error, the more likely the patient is to require eye drop medications for a prolonged period following the procedure