title: More on optical zone centration.
authors.forename: D L
authors.initials: DL
authors.lastname: Guyton
mesh_terms: D003315:Cornea / Q000033:anatomy & histology* / Q000502:physiology* / Q000601:surgery; D005403:Fixation, Ocular; D006801:Humans; D008027:Light; D009885:Ophthalmology / Q000295:instrumentation; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000503:physiopathology; D054140:Refractive Surgical Procedures