Laser surgery is performed on the cornea and involves modifying it to flatten the surface. Flattening the cornea implies thinning it out proportionally to the number of dioptres we want to correct. If the cornea does not have the initially required thickness, then it could become excessively thin and lose rigidity which would increase the possibility of an increased curvature due to weakness. This would lead to myopia yet again and an astigmatism that is difficult to correct. Intraocular lens surgery does not modify the structure of the cornea therefore it can be perfomed without any issues.