Multifocal surface for a multifocal spectacle lens

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

G - Physics

02

C

88/41

G02C 7/06 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2040216

Abstract of the Disclosure The invention is directed to a multifocal surface for a multifocal lens which, for a short progression zone between a far-vision zone and a 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. 16

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