PRK, also known as photorefractive keratectomy, is a predecessor of LASIK surgery. It involves reshaping the cornea to correct the refractive errors. In PRK surgery, the flap created is removed completely, due to which the surgery is also known as laser-assisted sub-epithelial keratectomy.
Similar to LASIK, PRK surgery changes the shape of the anterior central cornea by ablating the tissues. The epithelium tissue has the ability to grow back with no loss of clarity. Thus, the results of the surgery are similar to other vision correction procedures.