Multifocal surface for a multifocal spectacle lens

Details Multifocal surface for a multifocal spectacle lens Multifocal surface for a multifocal spectacle lens

1991-04-19

1992-08-11

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

051373432

ABSTRACT:
The invention is directed to a multifocal surface for a multifocal lens which, for a short progression zone between a far-vision zone and near-vision zone, has a large usable width of this zone and the near-vision zone, and for which the maximum value, which the surface astigmatism reaches on the multifocal surface, is less than the 1.1 multiple of the surface increment. Such a multifocal surface is obtained when this surface is configured as twice continuously differentiable and satisfies a combination of six features which relate to the distribution of surface astigmatism and mean surface refractive power across the multifocal surface.

REFERENCES:
patent: 3687528 (1972-08-01), Maitenaz
patent: 4606622 (1986-08-01), Fueter et al.
patent: 4729651 (1988-03-01), Kitani
patent: 4778266 (1988-10-01), Maitenaz
patent: 4934808 (1990-06-01), Kitani
"Neue Progressive Flachen" by G. Guilino and R. Barth, DOZ Nr. 11 Nov. 20, 1980.

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