Progressive multifocal lens

Details Progressive multifocal lens Progressive multifocal lens

1994-05-27

1996-04-09

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

055066305

ABSTRACT:
In a progressive multifocal lens of the present invention, the values of a curvature .rho.m of a refracting surface along the principal meridional curve and a curvature .rho.s of the refracting surface in a direction perpendicular to the principal meridional curve become maximum at approximately the center of a nearsight portion on the principal meridional curve, decrease toward the peripheral region of the nearsight portion along the principal meridional curve, are substantially different from each other at least from the lower portion of a farsight portion to approximately the center of a intermediate portion, are substantially equivalent from approximately the center of the intermediate portion to the lower portion of the intermediate portion, and are substantially different from each other from the lowest portion of the intermediate portion and the nearsight portion.

REFERENCES:
patent: 5000559 (1991-03-01), Takahashi et al.
patent: 5048945 (1991-09-01), Ueno et al.
patent: 5272495 (1993-12-01), Padrono
Guilino, "Design Philosophy For Progressive Addition Lenses," Applied Optics, vol. 32, No. 1, Jan. 1, 1993, pp. 111-117.

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