LASIK is an eye surgery that corrects nearsightedness, farsightedness and astigmatism – all of which are often caused by focusing errors that can be corrected by changing the shape of the cornea. (A cornea can be too steep causing nearsightedness, too flat causing farsightedness or football-shaped causing astigmatism.) News Technich like wave front LASIK & Phamto LASIK is very much advance technique to remove restrictive errors.