title: Ray vector fields, prentice's equation, and spherocylindrical lenses.
authors.forename: W F
authors.initials: WF
authors.lastname: Harris
mesh_terms: D001251:Astigmatism / Q000503:physiopathology / Q000628:therapy; D005139:Eyeglasses; D006801:Humans; D008027:Light; D008433:Mathematics; D055095:Optics and Photonics