Multifocal lens exhibiting diffractive and refractive powers

Details Multifocal lens exhibiting diffractive and refractive powers Multifocal lens exhibiting diffractive and refractive powers

G - Physics

02

B

G02B 3/10 (2006.01) A61F 2/16 (2006.01) G02B 3/08 (2006.01) G02B 5/18 (2006.01) G02B 27/00 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2378730

A multifocal lens including annular zones wherein each annular zone is divided into at least two annular sub-zones. Preferably, no geometric or optical steps are present between annular zones or annular sub-zones. The refractive powers within the annular sub-zones are chosen such that the lens exhibits at least two diffractive powers and that at least one of those diffractive powers substantially coincides with the average refractive power of each annular zone.

La présente invention concerne une lentille multifocale comportant des zones annulaires, dans laquelle chaque zone annulaire est divisée en au moins deux sous zones annulaires. Il n'existe, de préférence, aucun saut géométrique ou d'indice entre deux zones ou sous zones annulaires. Les puissances de réfraction à l'intérieur des sous zones annulaires sont choisies de manière telle que la lentille possède au moins deux puissances de diffraction et qu'au moins une de ces puissances de diffraction coïncide sensiblement avec la puissance de réfraction moyenne de chaque zone annulaire.

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