PRK VS LASIK

If you are considering laser vision correction there are two major procedures to consider: PRK and LASIK. Although LASIK is currently the more popular of the two, PRK predates it and can often be performed on people who are not LASIK candidates. If you are considering laser corrective surgery, familiarize yourself with the pros and cons of each.

What They Are

PRK and LASIK are two very similar forms of laser vision correction. PRK stands for photorefractive keratectomy and was the preferred form of refractive surgery before LASIK. Laser-assisted in situ keratomileusis, or LASIK is also a form of elective laser eye surgery that is currently the most popular and recognized.

What They Do

Both LASIK and PRK use an excimer laser to reshape the cornea by removing tissue. With PRK the laser is used directly on the cornea and a bandage contact lens is placed on the eye to facilitate healing. With LASIK, an instrument called a microkeratome is used to create a thin hinged flap on the cornea. The flap is lifted and the laser is applied. After the surgeon has finished the procedure, the thin flap is smoothed back into place and acts as a natural bandage.

Benefits of PRK

Because there is no flap involved, there is no risk of the flap becoming wrinkled or dislodged after PRK. People with thin corneas are generally not candidates for LASIK because they won't have enough tissue to create a flap and reshape the cornea. These individuals are however, candidates for PRK.

Benefits of LASIK

The greatest appeal of LASIK over PRK is that there is less discomfort associated with the procedure and that an improvement in vision is noticeable sooner. LASIK has less of a risk of eye infection following the surgery and there is less risk of temporary or permanent haziness.