Progressive multifocal lens

Details Progressive multifocal lens Progressive multifocal lens

1994-05-27

1996-04-23

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02B 706

Patent

active

055108601

ABSTRACT:
A progressive multifocal lens of the present invention has, along a principal meridional curve, 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, located between the farsight and nearsight portions, for continuously connecting the refracting powers of the farsight and nearsight portions, wherein a refracting surface has a shape such that the angle .theta. formed by normal lines of the refracting surface at respective points on each of vertical crossing curves of the lens refracting surface and a principal meridional curve is changed gently and monotonously away from the principal meridional curve along the respective vertical crossing curves in a direction perpendicular to the principal meridional curve.

REFERENCES:
patent: 5000559 (1991-03-01), Takahashi et al.
patent: 5270745 (1993-12-01), Padrono

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