Progressive ophthalmic lens

Details Progressive ophthalmic lens Progressive ophthalmic lens

1986-10-08

1989-08-08

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351168, G02C 706

Patent

active

048546895

ABSTRACT:
A progressive ophthalmic lens with a continuous progressive surface comprises a substantially constant power first area matched to far vision. It also has a substantially constant power second area matched to near vision. Between the first and second areas is a progressively varying power third area. This is defined by a central part extending to both sides of the main progression meridian. In this central area each line on the progressive surface parallel to the main progression meridian substantially satisfies at every point the following equation:

REFERENCES:
patent: 2878721 (1959-03-01), Kanolt
patent: 3687528 (1972-08-01), Maitenaz
patent: 4240719 (1980-12-01), Guilino et al.
patent: 4362368 (1982-12-01), Ligten
patent: 4640593 (1987-02-01), Shinohara
Treatise of Optical Instruments, "Optical Combinations-Practice of Calculations", Revue D'Optique Theorique et Instrumentale, Paris, 1967, by Jean Burcher, pp. 72-74.

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