The ophthalmological acronym LASIK stands for 'Laser-Assisted in Situ Keratomileusis'. It is a type of refractive surgery used to correct vision problems such as nearsightedness, farsightedness, and astigmatism. The procedure involves reshaping the cornea with a laser to improve the eye's ability to focus light onto the retina. It is a relatively safe and effective procedure that has been used since the 1990s.