Progressive power lens

Details Progressive power lens Progressive power lens

1997-03-13

1998-02-17

Nelms, David C.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

057196575

ABSTRACT:
A progressive power lens whose distance viewing vertex power is a negative value and in which a surface refractive power Pf.sub.m in the main meridional plane in a distance viewing portion is larger than a surface refractive power Pf.sub.s in a plane perpendicular to the main meridional plane (Pf.sub.m >Pf.sub.s). A surface refractive power Pn.sub.m in a section in the main meridional plane in a near viewing portion is smaller than the surface refractive power Pn.sub.s in a plane perpendicular to the main meridional plane (Pn.sub.m <Pn.sub.s).

REFERENCES:
patent: 4606626 (1986-08-01), Shinohara
patent: 4640593 (1987-02-01), Shinohara
patent: 4950057 (1990-08-01), Shirayanagi
patent: 4988182 (1991-01-01), Takahashi et al.
patent: 5210553 (1993-05-01), Barth et al.

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