Advance Centre for Cataract, Retina and Refractive Surgery
Phototherapeutic keratectomy (PTK) is a type of eye surgery that uses a laser to treat various ocular disorders by removing tissue from the cornea. PTK allows the removal of superficial corneal opacities and surface irregularities. The common indications for PTK are corneal dystrophies, scars and opacities.
Photorefractive keratectomy (PRK) 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 the popular LASIK procedure. Even now it is used in patients who have a thinner cornea, as PRK affects the corneal thickness less. PRK involves the Laser vision correction by directly doing laser on the corneal surface after removing the epithelium, unlike LASIK where laser is applied after making a corneal flap.
