Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1979-05-09
1981-03-03
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351176, 351177, G02C 706
Patent
active
042537479
ABSTRACT:
A method of preparing a surface of refraction of a progressively variable power ophthalmic lens, in which a first family of surfaces S.sub.1 having predetermined optical characteristics is determined within a given system of rederence. Within the same system of reference a second family of surfaces S.sub.2 having other predetermined characteristics is determined, each surfaces S.sub.1 of the first family is associated with each surfaces S.sub.2 and their curves of intersection C and D are determined. Among the pairs of surfaces S.sub.1 S.sub.2 is selected that one whose curves C and D provide therebetween a corridor respectively at least 15 and 18 mm wide in the intermediate vision zone Z.sub.2 ' and in the near vision zone Z.sub.3 '. The refractive surface S of the ophthalmic lens is selected so as to have the part of the surface S of the selected pair which is between the curves C and D, and the part of the surface S.sub.2 of the selective pair which is outside curves C and D.
REFERENCES:
patent: 2878721 (1959-03-01), Kanolt
patent: 3687528 (1972-08-01), Maitenaz
patent: 3711191 (1973-01-01), Tagnon
patent: 3785724 (1974-01-01), Cretin-Maitenaz
patent: 3910691 (1975-10-01), Maitenaz
patent: 4055379 (1977-10-01), Winthrop
patent: 4056311 (1977-11-01), Winthrop
patent: 4062629 (1977-12-01), Winthrop
Corbin John K.
Essilor International "Compagnie Generale d'Optique"
Sugarman Scott J.
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