Lasik Dedfinition: The word "LASIK" stands for "laser in situ keratomileusis" (sometimes also called "laser in situ keratomileusis"). It is a surgical procedure by which visual correction is ensured. For that reason, sometimes it is also known as corrected surgery. By reshaping cornea, it reduces the demand of glasses or contact lenses for visual correction. It is a alternative way to see clear and obtain normal visual acuity, like 6/6.