title: Diffractive properties of the Diffrax bifocal contact lens.
abstract: We have verified that the Pilkington Diffrax lens behaves optically as a diffractive bifocal contact lens. The longitudinal chromatic aberration of the lens is similar to that predicted by theory, both on and off the eye. The over-refraction with the lens on the eye is similar to the distance subjective refraction, which is also as predicted.
authors.affiliation: Centre for Eye Research, School of Optometry, Queensland University of Technology, Brisbane, Australia.
authors.forename: D A
authors.initials: DA
authors.lastname: Atchison
authors.forename: L N
authors.initials: LN
authors.lastname: Thibos
mesh_terms: D003261:Contact Lenses; D006801:Humans; D055095:Optics and Photonics; D012029:Refraction, Ocular; D013053:Spectrophotometry