LASIK (laser in situ keratomileusis) is a form of outpatient corneal surgery in which a surgeon uses a specialised and precise flap- making instrument, to create a thin flap of corneal tissue. This flap is raised and laid back while still attached to the cornea. The surgeon then uses a state-of-the-art excimer laser to remove a pre- determined amount of corneal tissue from the exposed bed of the cornea. The amount of tissue to be removed is calculated based on the pre-operative determination of the power of your eye; these measurements are usually in agreement with recent prescriptions for your glasses and/or contact lenses. The flap is replaced and within minutes natural forces hold the flap down on the cornea. Usually, within a few hours, the surface epithelium of the cornea begins to grow over the cut edge of the flap to seal it into position. LASIK can be used to correct short-sightedness (myopia), long- sightedness (hyperopia), and astigmatism.
PRK (photorefractive keratectomy) is a form of outpatient corneal surgery in which a surgeon gently removes the surface covering layer of the cornea called the epithelium, and then reshapes the corneal bed with the laser in the same way as LASIK. This technique is usually used for people whose cornea may be too thin to allow for the creation of the corneal flap required for LASIK. The procedure is used to correct shortsightedness (myopia). Long-sightedness (hyperopia) and astigmatism.
Like LASIK and PRK treatments, LASEK (Laser Epithelial Keratomileusis) is a clinically proven outpatient procedure for the treatment of a full range of sight problems, including myopia (short-sightedness), hyperopia (long-sightedness), presbyopia and astigmatism. LASEK combines the advantages of both LASIK and PRK, making it a viable alternative to those not suitable for LASIK.