title: A capstan toric surface can occur in two distinct forms descriptively termed pulley and capstan forms.
authors.affiliation: Department of Optometry, Rand Afrikaans University, Johannesburg, South Africa.
authors.forename: W F
authors.initials: WF
authors.lastname: Harris
mesh_terms: D005139:Eyeglasses; D055095:Optics and Photonics