What are the contra-indications of lasik?

Several exist. Unstable refraction, thin cornea, abnormal topography, certain autoimmune diseases, unsuitable refractive error, coexisting ocular disease, dry eye unresponsive to treatment, corneal dystrophy.
Several. Lasik cannot work if the power of the eye needs for correction is too high like myopia over -11.00 power. It can be difficult if the cornea is too thin. If the eyes has internal problems like uveitis, or glaucoma, then this might be a problem and should not be done during pregnancy. Dry eyes can predict dry eyes afterwards. Discuss yours eyes with a lasik surgeon.