title: A comparison of three methods for the measurement of progressive addition lenses.
abstract: Three methods of measuring aberrational astigmatism in progressive addition spectacle lenses are described. Measurements are presented from each method made on an Essilor Varilux 2 lens, which illustrate the small differences between the methods for low power lenses.
authors.affiliation: Vision Sciences Department, Aston University, Birmingham, UK.
authors.forename: C W
authors.initials: CW
authors.lastname: Fowler
authors.forename: C M
authors.initials: CM
authors.lastname: Sullivan
mesh_terms: D005139:Eyeglasses; D008722:Methods; D055095:Optics and Photonics