Progressive spectacle lens with low magnifying differences

Details Progressive spectacle lens with low magnifying differences Progressive spectacle lens with low magnifying differences

2005-02-01

2005-02-01

Schwartz, Jordan M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S168000

Reexamination Certificate

active

06848788

ABSTRACT:
A spectacle lens comprises a region (distance portion) designed for viewing at large distances and in particular “to infinity”; a region (near portion) designed for viewing at short distances and in particular “reading distances”; and a progressive zone disposed between the distance portion and the near portion, in which the power of the spectacle lens increases from a value at a distance reference point located in the distance portion to a value at the near reference point located in the near portion along a curve (principal line) veering towards the nose. The invention is distinguished by a combination of the following features: a change of magnification with a direction of sight is small; the magnification increases radially, starting from the distance reference point; the difference between the magnifications at the distance and near reference points is small.

REFERENCES:
patent: 4786160 (1988-11-01), Furter
patent: 5110199 (1992-05-01), Ishida
patent: 5926250 (1999-07-01), Mukaiyama et al.
patent: 6019470 (2000-02-01), Mukaiyama et al.
patent: 0 627 645 (1994-05-01), None
patent: 0 809 126 (1997-11-01), None
International Search Report Jun. 12, 2001 PCT/DE01/01580.

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