PHOTOREFRACTIVE KERATECTOMY (PRK)

PHOTOREFRACTIVE KERATECTOMY (PRK) is the sculpting of the cornea's surface via the use of the excimer cold laser. The laser vaporizes the surface layer through a series of extremely precise laser pulses under the control of a computer. PRK has been approved in the United States by the FDA for the treatment and correction of low to moderate myopia. 

While not currently authorized for far-sightedness, PRK is being investigated in the United States for that particular use.