Corneal refractive surgery is the most performed ophthalmic procedure in the world. Despite the huge leaps in advancing this technology to reduce the risks of intraoperative and postoperative complications, there is still a very small risk to develop sight threatening complication such as cornea ectasia. Two surgical techniques, laser-assisted in situ keratomileusis and photorefractive keratectomy, have been used to correct myopia.Corneas at risk of ectasia are usually thinner with abnormal topographies, but some normal thin corneal with normal topographies have developed ectasia, a distinction sometimes hard to make between myopia with such corneas and subclinical cases of keratoconus or forme frust keratoconus.