Double progressive spectacle lens

Details Double progressive spectacle lens Double progressive spectacle lens

2006-12-05

2006-12-05

Schwartz, Jordan M. (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S177000

Reexamination Certificate

active

07144110

ABSTRACT:
A double progressive spectacle lens having a prefabricated progressive surface and a second progressive surface for correcting a spherical ametropia or a cylindrical ametropia, in which the surface properties of the progressive surface in the vicinity of the principal line of sight are asymmetric, the asymmetry being determined by the symmetry factor SA, which is determined in relation to the level A by the ratio of the smaller to the larger horizontal distance between the principal line of sight and the location at which the surface astigmatism in the horizontal section reaches the value A [dpt].

REFERENCES:
patent: 6074061 (2000-06-01), Miura
patent: 6123422 (2000-09-01), Menezes et al.
patent: 6231184 (2001-05-01), Menezes et al.
patent: 2004/0080711 (2004-04-01), Menezes
patent: 2005/0068493 (2005-03-01), Menezes
patent: 103 31 300 (2004-02-01), None
patent: 0 724 179 (1996-07-01), None
patent: WO 02/061496 (2002-08-01), None

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