title: Assessment of toroidal surfaces by the measurement of curvature in three fixed meridians.
abstract: A method is described where the surface curvatures and axis orientation of a toroidal surface can be determined by measuring the lens in three fixed orientations. This method also has possible applications in the measurement of progressive addition lenses.
authors.affiliation: Vision Sciences Department, Aston University, Birmingham, UK.
authors.forename: C W
authors.initials: CW
authors.lastname: Fowler
mesh_terms: D000886:Anthropometry; D006801:Humans; D007908:Lens, Crystalline / Q000033:anatomy & histology*; D008433:Mathematics; D012399:Rotation