We have a detailed article on keratoconus
and its treatment that you may find interesting.
Keratoconus is a disease that causes a weakening of the cornea. Lasik can exacerbate keratoconus, but does not "cause" keratoconus. Pre-diagnosed keratoconus is a contraindication for Lasik, but it there may not have been signs of keratoconus at the time you had surgery.