Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1996-10-15
1998-09-08
Font, Frank G.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351177, 351178, G02G 702
Patent
active
058052631
ABSTRACT:
The present invention concerns an optically non correcting lens blank for the manufacture of an optically non correcting lens, having a high curvature, corresponding to an average radius of curvature at most equal to about 90 mm, said lens blank comprising a transparent blade, and having on the one hand, a geometrical axis, passing through said blade and defining a geometrical center, and on the other hand, an optical axis defining an optical center, the blade, when seen in elevation, further having a generally non circular contour, the optical axis and geometrical axis, and thus the optical and geometrical centers, being physically separated by a predetermined distance from each other and angularly displaced, the blade further comprising stacking correction means, which are integrated with or affixed to the contour of the blank.
REFERENCES:
patent: 1741536 (1929-12-01), Rayton
patent: 4656590 (1987-04-01), Ace
patent: 4781452 (1988-11-01), Ac
patent: 4969729 (1990-11-01), Merle
patent: 5648832 (1997-07-01), Houston et al.
patent: 5689323 (1997-11-01), Houston et al.
Billard Etienne
Reymondet Bernard
Christian Dalloz S.A.
Font Frank G.
Vierra-Eisenberg Jason D.
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