title: Aberrations of sphero-cylindrical ophthalmic lenses.
abstract: The authors have presented in two previous articles the graphic solutions resembling Tscherning ellipses, for spherical as well as for aspherical ophthalmic lenses free of astigmatism or power error. These solutions were exact, inasmuch as they were based on exact ray tracing, and not third-order theory as frequently done. In this paper sphero-cylindrical lenses are now analyzed, also using exact ray tracing. The functional dependence of the astigmatism and the power error for these lenses is described extensively.
authors.affiliation: Centro de Investigaciones en Optica, A.C., Leon, Gto, Mexico.
authors.forename: Z
authors.initials: Z
authors.lastname: Malacara
authors.forename: D
authors.initials: D
authors.lastname: Malacara
mesh_terms: D003198:Computer Simulation; D005139:Eyeglasses; D008433:Mathematics; D055095:Optics and Photonics