title: Varifocal spectacle lens surface power measurement.
abstract: An instrument is described for the assessment of varifocal lens surfaces based on a reflection technique. Results are also presented of measurements made on a series of lenses of the same design, illustrating some of the differences that exist between glass and plastics versions of the same lens.
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 / Q000592:standards*; D005898:Glass; D010969:Plastics; D011786:Quality Control; D012031:Refractometry / Q000295:instrumentation
chemical_list: D010969:Plastics