Photorefractive Keratectomy (PRK)

Photorefractive Keratectomy (PRK) combines state-of-the-art computer technology with advanced laser precision. PRK is a procedure that uses the laser to change the shape of the cornea, improving the way light rays are focused on the retina.

Ultraviolet light and high-energy pulses lasting only billionths of a second disrupt the molecular bonds between the corneal cells with an accuracy of 0.25 microns. An Excimer laser corrects astigmatism by using an elliptical rather than a circular beam. PRK uses this laser beam to precisely sculpt the surface of the cornea to a new shape, with the total amount of cornea sculpted usually measuring less than one-fourth the thickness of a single human hair. The Excimer laser is unique because it emits a non-thermal (cold) light beam, and PRK does not weaken the structure of the cornea as RK (radial keratometry) does.

The procedure is performed on an outpatient basis and usually takes approximately 10 minutes. Patients are given anesthetic eyedrops to eliminate all feeling in the eye. While looking at a blinking light, the laser reshapes your eye in less than 60 seconds. Modern lasers can track and compensate for any eye movement. Dr. Kerry Assil uses the only system of surgeon-monitored 3D eye tracking to further maximize treatment accuracy. Immediately after the laser treatment, a bandage contact lens is placed over the eye for comfort. The epithelium (the outer layer, or "dead skin") of the cornea will heal within 24-72 hours after the procedure. The bandage contact lens will be removed when the epithelium has regenerated. Some patients see a dramatic improvement in their vision the first day. For others, vision may improve more gradually and may fluctuate mildly for several weeks to several months. This fluctuation is part of the healing process and as healing progresses, stabilization occurs. Most patients return to normal activities within two to four days.