LASIK - is a surgical procedure that uses a laser to correct nearsightedness, farsightedness, and/or astigmatism. In LASIK, a thin flap in the cornea is created using either a microkeratome blade or a femtosecond laser. The surgeon folds back the flap, then removes some corneal tissue underneath using an excimer laser.
PRK - (photorefractive keratectomy) is a type of refractive surgery to correct myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. PRK was the first type of laser eye surgery for vision correction and is the predecessor to LASIK procedure. PRK differs from LASIK, in that the surgeon does not create a flap. PRK surgery is best suited for patients with thinner corneas, or with vocational or sports-related limitations where a corneal flap is contraindicated.