Progressive power lens

Details Progressive power lens Progressive power lens

1994-06-20

1997-09-09

Epps, Georgia Y.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

056661843

ABSTRACT:
A progressive power lens comprising, along a principal meridional curve dividing a lens refracting surface into a nasal side region and a temporal side region, a portion for distant vision having a refracting power corresponding to a distant view, a portion for near vision having a refracting power corresponding to a near view and an intermediate portion, located between the portion for distant vision and the portion for near vision, for continuously connecting the refracting powers of the portions for distant and near vision, wherein the principal meridional curve is displaced with respect to a vertical direction in the state with the lens worn toward the nasal side in the intermediate portion and the portion for near vision, and an astigmatic difference distribution in a horizontal direction in the worn state is symmetrical with respect to the principal meridional curve in the intermediate portion and asymmetrical with respect to the principal meridional curve in the portion for near vision.

REFERENCES:
patent: Re34132 (1992-11-01), Kitani
patent: 3785724 (1974-01-01), Cretin-Maitenaz
patent: 4606622 (1986-08-01), Fueter et al.
patent: 4762408 (1988-08-01), Shinohara

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