title: Spectacle lenses and third-order distortion.
abstract: Third-order formulae are developed for calculation of distortion in thin spectacle lenses, when one or both surfaces are conicoid aspherics. Solutions which allow correction of rotatory or peripheral distortion, when one lens surface is a conicoid aspheric, are illustrated. A study of these solutions shows that one of the off-axis power errors (e.g. oblique astigmatism) and one of the distortions can be simultaneously eliminated, but the lens forms required are too curved to be cosmetically feasible.
authors: Department of Optometry, Queensland Institute of Technology, Brisbane, Australia.
authors: D A
authors: DA
authors: Atchison
authors: G
authors: G
authors: Smith
mesh_terms: D005139:Eyeglasses; D008433:Mathematics; D055095:Optics and Photonics; D012399:Rotation