title: A systematic review of Ferrara's ring in the treatment of keratoconus.
authors.forename: Regina P
authors.initials: RP
authors.lastname: El Dib
authors.forename: Denise
authors.initials: D
authors.lastname: de Freitas
mesh_terms: D006801:Humans; D003319:Corneal Stroma / Q000601:surgery; D007640:Keratoconus / Q000601:surgery; D019736:Prostheses and Implants; D019919:Prosthesis Implantation