PRK, RK, and AK

PRK

Photorefractive Keratectomy (PRK) also utilizes the Excimer Laser to re-shape the corneal curvature. Instead of making a protective flap with the microkeratome as in LASIK, the laser energy is applied directly to the surface of the cornea. This procedure works well for lower refractive errors. However, it carries a slightly greater risk of hazing (scarring) of the cornea, and may, during the healing period, be more uncomfortable than LASIK. It is recommended that only one eye be treated at a time with PRK, and the second eye is treated 2-3 months later.

Radial Keratotomy (RK)

Radial Keratotomy (RK) is an older surgical procedure that is somewhat less accurate than either LASIK or PRK, and tends to have less long-term stability. It is less expensive than laser procedures, and, although it may be considered suitable for smaller refractive errors, it has generally 'fallen out of favor' with most modern refractive surgeons.

Astigmatic Keratotomy (AK)

Astigmatic Keratotomy (AK) is a useful procedure for treating astigmatism alone. In this procedure, two small relaxing incisions are made on the surface of the cornea where it is curved too steeply. These incisions will flatten the steeper curve, making it more closely match the flatter curve, thus reducing or eliminating astigmatism.