What is Advanced Surface Ablation, or ASA ?
Laser photorefractive keratectomy (PRK) was approved by the FDA in October 1995, and PRK is also performed using an excimer laser. This laser produces cool light energy that precisely removes microscopic amounts of corneal tissue. With PRK, laser energy is delivered to the surface of the cornea without the creation of a flap, as in LASIK. The laser “sculpts” the cornea to produce a new curvature; for nearsightedness and astigmatism, the laser is used to flatten the central corneal curvature. To treat farsightedness (hyperopia), the laser can be used to cause central corneal steepening. ASA is the previous PRK procedure, but reflects recent advancements such as mitomycin application to improve the healing response. It is particularly well suited for patients with thinner corneas. ASA and LASIK patients may both undergo simultaneous (bilateral) procedures. LASIK is usually a better choice when considering simultaneous surgery. Our practice performs over 95% LASIK due to its quicker heali
