title: Stability of refraction during four years after radial keratotomy in the prospective evaluation of radial keratotomy study.
authors.forename: S
authors.initials: S
authors.lastname: MacRae
mesh_terms: D005069:Evaluation Studies as Topic; D006801:Humans; D007646:Keratotomy, Radial; D008137:Longitudinal Studies; D011446:Prospective Studies; D012030:Refractive Errors / Q000503:physiopathology; D054140:Refractive Surgical Procedures; D016896:Treatment Outcome