title: Progressive addition and variable focus lenses: a review.
abstract: This paper reviews recent developments in the field of progressive addition spectacle lenses and variable focus lens systems design. The study is a sequel to the previous analytical work of von Rohr (1916), Graham (1942), and Bennett (1970). A brief history of the work documented by the aforementioned authors is presented. Comparative assessment is undertaken of the most recent patents of progressive addition and variable focus spectacle lenses. A largely verbal description is employed because patent literature is often devoid of mathematical models.
authors.affiliation: Department of Vision Sciences, Aston University, Birmingham, UK.
authors.forename: C M
authors.initials: CM
authors.lastname: Sullivan
authors.forename: C W
authors.initials: CW
authors.lastname: Fowler
mesh_terms: D005139:Eyeglasses; D006801:Humans; D055095:Optics and Photonics; D009907:Optometry / Q000639:trends*