LASIK (an abbreviation for "laser-assisted in situ keratomileusis”) is a laser eye surgery used to correct vision. LASIK can correct short-sightedness, long-sightedness, and astigmatism. During LASIK surgery the surgeon creates a flap in the outer surface of the cornea and uses a laser to shape the exposed tissue before closing and reattaching the flap. The whole procedure takes 30 minutes to an hour and typically improves visual acuity to the point where patients no longer need glasses or contact lenses. LASIK surgery is not recommended for patients who are pregnant or breastfeeding, patients under 21 or those with diabetes or pre-existing eye disease. Suitable candidates must have had stable vision for at least a year, and have healthy eyes with sufficient corneal thickness. Your optician will be able to tell you if you are a suitable candidate for LASIK surgery.