Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1989-05-15
1992-05-19
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351161, G02C 704
Patent
active
051142201
ABSTRACT:
Disclosed is an ophthalmic lens which characteristically comprises at least two concentric regions having diffractive components with different phase profiles in order to use different orders of diffraction. The diffractive components may be formed by holograms in relief or index holograms.
REFERENCES:
patent: 4210391 (1980-07-01), Cohen
patent: 4637697 (1987-01-01), Freeman
Baude Dominique
Chavel Pierre
Joyeux Denis
Taboury Jean
Dzierzynski Paul M.
Essilor International "Compagnie Generale d'Optique"
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