Progressive power lens

Details Progressive power lens Progressive power lens

1990-07-11

1991-09-17

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

050489453

ABSTRACT:
In a progressive power lens has a farsight portion having a refracting power corresponding to a distant view, a nearsight portion having a refracting power corresponding to a near view, and an intermediate portion for continuously and smoothly connecting the refracting powers of the farsight and nearsight portions between the two portions along a principal meridional curve, when the intermediate portion as a progressive power range is shortened, optimal shapes of respective portions are found out in terms of a vertical sectional shape of a refracting surface, and an aberration blance in the overall refracting surface is optimized.

REFERENCES:
patent: 3687528 (1972-08-01), Maitenaz
patent: 3910691 (1975-10-01), Maitenaz
patent: 4946270 (1990-08-01), Guilino et al.

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