Progressive power presbyopia-correcting ophthalmic lenses

Details Progressive power presbyopia-correcting ophthalmic lenses Progressive power presbyopia-correcting ophthalmic lenses

1995-08-22

1998-07-07

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

057777160

ABSTRACT:
An ophthalmic lens includes a refractive surface partitioned into a first area, a second area located above the first area and a third area located below the first area. The first area includes a reading point providing a first refractive focal power on a meridional line. The second area provides a surface refractive focal power less than that of the reading point, and the third area provides a surface refractive focal power stronger than that of the reading point. The refractive focal power in the first area progressively changes between the second and third areas. The first area includes a quasi-clear vision area that has a maximum horizontal width in the proximity of the geometrical center of the lens and a clear vision area.

REFERENCES:
patent: 3785724 (1974-01-01), Cretin-Maitenaz
patent: 4315673 (1982-02-01), Guilino et al.
patent: 4537479 (1985-08-01), Shinohara et al.
patent: 4762408 (1988-08-01), Shinohara
patent: 4952047 (1990-08-01), Barth et al.
patent: 5123725 (1992-06-01), Winthrop

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