While LASIK is a very effective treatment for refractive errors, the procedure is avoided and considered harmful to patients who are diagnosed with keratoconus.
LASIK relies upon reshaping the cornea to achieve an accurate and effective result. With keratoconus, the cornea is not healthy and will react negatively to any attempt at reshaping.
While there are effective treatments for keratoconus, LASIK is not considered to be one of them. Please consult with a cornea specialist in your area to find out what is the best treatment in your particular case.