Progressive lens

Details Progressive lens Progressive lens

1986-09-12

1989-01-10

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351171, G02C 706

Patent

active

047969881

ABSTRACT:
A progressive lens with a continuous surface comprises three substantially constant power areas. A first such area is mathced to far vision, a second to near vision and a third, between the first and second areas, to intermediate vision. Respective progressively varying power areas lie between the first and third areas and between the third and second areas. A predetermined progress meridian passing through these substantially constant power areas may have substantially umbilical parts between the substantially constant power areas.

REFERENCES:
patent: 1427192 (1922-08-01), Bugbee
patent: 3711191 (1973-01-01), Tagnon
patent: 4056311 (1977-11-01), Winthrop
patent: 4418992 (1983-12-01), Davenport et al.
patent: 4461550 (1984-07-01), Legemdre
patent: 4484804 (1984-11-01), Mignen
patent: 4580883 (1986-04-01), Shinohara

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