title: Effect of defocus on on-axis wave aberration of a centered optical system.
abstract: We derive equations for defocus and primary spherical wave aberration coefficients caused by a shift in image plane of a perfect optical system. The spherical aberration equation is accurate at describing changes in the spherical aberration of an aberrated schematic eye.
authors.affiliation: Department of Optometry and Vision Sciences, University of Melbourne, Parkville VIC 3052, Australia.
authors.forename: George
authors.initials: G
authors.lastname: Smith
authors.forename: David A
authors.initials: DA
authors.lastname: Atchison
authors.forename: Sergio
authors.initials: S
authors.lastname: Barbero