title: [A variable prism].
abstract: A new compact and convenient prism consisting of a planoconvex and a planoconcave cylindrical lens varies continuously in strength between 0 and 90 prism diopters. The relationship between the angle of incidence and the prism dioptric power is discussed.
authors.affiliation: Henan Institute of Ophthalmology, Zhengzhou.
authors.forename: W
authors.initials: W
authors.lastname: Zhou
authors.forename: J P
authors.initials: JP
authors.lastname: Wang
mesh_terms: D006801:Humans; D007909:Lenses; D055095:Optics and Photonics / Q000295:instrumentation*; D013285:Strabismus / Q000175:diagnosis