Laser in-situ keratomileusis (Lasik) is a surgical procedure that uses a laser to correct nearsightedness, farsightedness, and/or astigmatism. In Lasik, a thin flap in the cornea is created using either a microkeratome blade or a femtosecond laser. The surgeon folds back the flap, then removes some corneal tissue underneath using an excimer laser. The flap is then laid back in place, covering the area where the corneal tissue was removed.
With nearsighted people, the goal of Lasik is to flatten the too-steep cornea; with farsighted people, a steeper cornea is desired. Lasik can also correct astigmatism by smoothing an irregular cornea into a more normal shape.
Other procedures similar to lasik are SMILE eye surgery (which is the newest method of laser eye surgery) and femto-lasik (which also called bladeless lasik). Read about these surgeries to know which one might be the best option for you.