Photorefractive Keratectomy (PRK) is the orginal laser vision correction procedure performed by the excimer laser. It can be used to correct myopia, hyperopia and/or astigmatism. Drops are placed to numb the eye. The epithelium or outer layer of the cornea is then removed and the laser is used to shape the cornea to correct your vision.

This reshaping of the cornea allows the light rays entering the eye to be focused on the retina, resulting in clearer vision. Since the layer of cornea tissue removed is so thin, the cornea is not weakened. A contact lens is placed on the eye and is left in place until the epithelium heals. This usually takes 5-6 days. Drops and medications are used to help alleviate the small amount of discomfort that usually occur during this healing phase.

The vision starts to improve once the contact lens has been removed and continues over the next 4 to 6 months. Drops are usually used for 3 months or so.

Results are excellent with more than 95% of patients achieving uncorrected vision that is good enough to drive a car. One of the main risks that can affect the results is the possibility of haze development during healing. The risk of this is minimal, but present, particularly in patients with high myopia. If indicated, a medication called Mitomycin C is applied during surgery to minimize this risk.