Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1978-06-28
1980-03-25
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, G02C 704
Patent
active
041948157
ABSTRACT:
The inner surface of a semi-scleral contact lens is shaped relative to the topography of an individual eyeball to achieve central contact and edge contact with tearfilm clearance therebetween. The lens has improved centering properties. The lens includes an optical zone which is the spherical equivalent of the radius of curvature of the cornea at its optical centerline and the corneal dimensional diameter. The optical zone has a sagittal depth which is dependent on the topography of the cornea. The lens also includes a conoid section which is tangent to the edge of the optical zone and which extends from the edge of the optical zone to a selected point over the limbus. A peripheral curve having an individual radius of curvature extends from the selected point to the edge of the lens.
REFERENCES:
patent: Re29229 (1977-05-01), Girard et al.
patent: 1921972 (1933-08-01), Fertsch et al.
patent: 3482906 (1969-12-01), Volk
patent: 3937566 (1976-02-01), Townsley
Fainbloom, et al.; "Fitting Ellipsoidal Contact Lenses,"; Contacto, vol. 16, No. 1, Mar. 1972, pp. 36-38.
Corbin John K.
Dow Corning Corporation
Kenemore Max J.
Sugarman Scott J.
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