Vision-correcting surgery, also known as LASIK (an acronym for Laser-Assisted in Situ Keratomileusis), is a type of eye surgery that is used to correct vision problems such as nearsightedness, farsightedness, and astigmatism. It involves reshaping the cornea with a laser to improve the way light enters the eye and focuses on the retina. The procedure is usually done on an outpatient basis and can be completed in less than 30 minutes. Patients typically experience improved vision within 24 hours after the surgery.