Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-05-02
1987-02-03
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351161, 351177, G02C 704, G02C 706
Patent
active
046405950
ABSTRACT:
A contact lens is disclosed wherein at least one of its surfaces, generally the posterior surface, is an aspheric surface of revolution which decreases in curvature from its apex to its periphery and which varies in a continuous and regular manner in eccentricity from its apex to its periphery. The novel surface is defined in terms of three parameters: apical radius of curvature; apical eccentricity; and collectively one or more derivatives of eccentricity. The lens with the novel surface posterior is so designed that the novel surface approximates the contour of the cornea while at the same time producing optical properties in the lens for optimal correction of the refractive error of the non-presbyopic eye, and when presbyopia exists, for the correction of the refractive error of the eye and presbyopia.
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Daniel O. Elliott, Jr.--"A Preliminary Report on Use of Gradient Elipsoidal Curves Relative to Fitting of Contact Lenses"--The Optometric Weekly, vol. 55, No. 21, May 21, 1964, pp. 21 & 22.
Corbin John K.
Sugarman Scott J.
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