PRK or photorefractive keratectomy is one of the oldest techniques of refractive surgery witch allows to correct myopia (near-sightedness), hyperopia (far-sightedness), astigmatism and presbyopia (long-sightedness) using the excimer laser (ultraviolet radiance) to reshape the cornea.
First step of the PRK technique involves removing the cornea’s entire epithelial (outer) layer by using laser or by scrapping it with a surgical instrument (spatula).
Afterwards the PRK laser allows destruction of cornea’s superficial layers and reducing its thickness. Witch results in remodeling the corneal surface and an adjustment of its curvature.(See video below)
The surgeon takes off the epithelial using a spatula.
The excimer laser reshape the cornea surface.
Then a temporary contact lens will be placed as a bandage.
The PRK procedure is short and completely painless. It takes 5 minutes per eye under local anesthetic. At the end the treated cornea will be covered with a bandage contact lens.
During the recovery process, the patient might experience some minor pain or irritation while the epithelial surface is healing. It usually takes 3 to 6 days.