Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1991-04-15
1993-08-10
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, G02C 702, G02C 706
Patent
active
052353591
ABSTRACT:
The front surface, for example, of a progressive ophthalmic lens has a central area whose curvature varies progressively over at least part of at least one meridian and constitutes its optically active area. Surrounding this central area is a peripheral joining area merging tangentially with it. The optically active central area of the front surface is delimited by a closed curve which, when projected onto a plane perpendicular to the geometrical axis of the lens, is generally oval shape. The value and/or sign of the radius of curvature of the radial cross-section of the peripheral joining area varies in the circumferential direction so that the thickness of the lens is substantially the same all along its peripheral edge. Progressive ophthalmic lenses of this kind are easier to manufacture, lighter in weight and more esthetic.
REFERENCES:
patent: 3687528 (1972-08-01), Maitenaz
patent: 4118853 (1978-10-01), Mignen
patent: 4461550 (1984-07-01), Legendre
patent: 4514061 (1985-04-01), Winthrop
patent: 4561736 (1985-12-01), Furter
Chauveau Jean-Pierre
Deforges Jean-Paul
Harsigny Christian
Essilor International "Cie Generale d'Optique
Sugarman Scott J.
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