What is the most common laser surgery?

The most common laser surgery is probably LASIK (laser-assisted in situ keratomileusis). It's a type of refractive surgery used to correct vision problems like nearsightedness, farsightedness, and astigmatism. 

Here's how it works: During LASIK, a surgeon uses a laser to reshape the cornea, which is the clear front part of the eye. By reshaping the cornea, the surgeon can change how light enters the eye, which corrects vision problems. The procedure is relatively quick and usually painless, and many people experience improved vision almost immediately after surgery.

LASIK has become incredibly popular because it can drastically reduce or even eliminate the need for glasses or contact lenses. Plus, it's considered very safe and effective for most people.

Of course, like any surgery, LASIK does carry some risks and potential side effects, such as dry eyes, glare, or halos around lights at night. But overall, it's been a game-changer for millions of people looking to ditch their glasses or contacts and enjoy clearer vision.