title: Generation of third-order spherical and coma aberrations by use of radically symmetrical fourth-order lenses.
abstract: We have extended the method of Alvarez [J. Am. Optom. Assoc. 49, 24 (1978)] to generate a variable magnitude of third-order spherical and/or coma aberration by using a combination of fourth-order plates with a magnification system. The technique, based on the crossed-cylinder aberroscope, is used to measure the wave-front aberration generated by the plates. The method has been applied to correct the third-order spherical aberration generated by an artificial eye as well as the coma produced by a progressive addition ophthalmic lens. The simplicity of the method and its relatively low cost make it attractive for partial correction of the aberrations of the eye.
authors.affiliation: Section of Neurobiology and Behavior, Cornell University, Ithaca, New York 14853-2702, USA. norberto@fcu.um.es
authors.forename: N
authors.initials: N
authors.lastname: López-Gil
authors.forename: H C
authors.initials: HC
authors.lastname: Howland
authors.forename: B
authors.initials: B
authors.lastname: Howland
authors.forename: N
authors.initials: N
authors.lastname: Charman
authors.forename: R
authors.initials: R
authors.lastname: Applegate
mesh_terms: D006801:Humans; D007909:Lenses; D008954:Models, Biological; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000209:etiology* / Q000503:physiopathology* / Q000628:therapy