ADVANCED SURFACE ABLATION (ASA):
AN ALTERNATIVE TO LASIK FOR THOSE
WITH HIGH MYOPIA AND OTHER ISSUES
Advanced Surface Ablation (ASA) serves as a proven, viable alternative for patients with high myopia (also called nearsightedness, up to -12 diopters), dry eyes, thin corneas, steep central corneas or high-oblique astigmatism. In such cases, ASA offers a more conservative option than LASIK.
ASA is modeled on a previous procedure called PRK (Photo Refractive Keratectomy). Once the epithelium (cells that make up the outer surface of the cornea) are removed, the Excimer laser is employed by the surgeon as it would be in LASIK.
The new procedure’s appeal is two-fold. First, for an equivalent correction, surface ablation leaves a structurally stronger cornea than after LASIK. Instead of the Intralase laser or a microkeratome (blade), a special brush is utilized to remove the epithelium. This brush leaves a smooth surface with well-defined epithelial edges that appears to enhance healing. Since the corneal nerves are not cut as in LASIK, the tear film is not affected (which may benefit patients with dry eye).
The second benefit is ASA may also provide superior optical outcomes for these aforementioned types of patients. Studies have shown that with traditional LASIK, the making of the flap removes tissue and decreases the surface area of the bed – resulting in a flap that may be too large. ASA does not do this. In FDA studies of wavefront-customized ablation, the PRK outcomes were often superior to the LASIK outcomes in comparable eyes.
As with all types of surgery, risks and side effects can occur. Previously, surface ablation had problems in pain, haze, delayed recovery and regression. New technologies and techniques have been developed which are helping minimize these issues.
Dr. Whitsett will be glad to explain these advances during his complimentary consultation.
