<unk>  with riboflavin (vitamin B2) and UV-A light is a surgical treatment for corneal ectasia such as keratoconus, PMD, and post-LASIK ectasia. It is used in an attempt to make the cornea stronger. According to a 2015 Cochrane review, there is insufficient evidence to determine if it is useful in keratoconus. In 2016, the US Food and Drug Administration approved riboflavin ophthalmic solution<unk><unk>  based on three 12-month clinical trials.
Corneal cross-linking
Corneal transplantation
Phototherapeutic keratectomy
Radial keratotomy
Laser thermal keratoplasty
Photorefractive keratectomy
Conductive keratoplasty
Descemet membrane endothelial keratoplasty