Multifocal lens having a progressive optical power region...

G - Physics – 02 – C

Patent

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G02C 7/06 (2006.01)

Patent

CA 2679977

Embodiments of the present invention relate to a multifocal lens having a mostly spherical power region and a progressive optical power region. Embodiments of the present invention provide for the proper alignment and positioning of each of these regions, the amount of optical power provided by each of the regions, the optical design of the progressive optical power region, and the size and shape of each of the regions. The combination of these design parameters allows for an optical design having less unwanted astigmatism and distortion as well as both a wider channel width and a shorter channel length compared to conventional PALs. Embodiments of the present invention may also provide a new, inventive far-intermediate distance zone and may further provide for increased vertical stability of vision within a zone of the lens.

La présente invention concerne une lentille multifocale possédant une région de puissance essentiellement sphérique et une région de puissance optique progressive. L'invention décrit la manière permettant d'aligner et de positionner correctement chacune de ces régions, la quantité de puissance optique fournie par chacune des régions, la conception optique de la région de puissance optique progressive et la taille et la forme de chacune des régions. La combinaison de ces paramètres de conception permet d'obtenir une conception optique présentant moins d'astigmatisme et de distorsion ainsi qu'une plus grande largeur de canal et une plus courte longueur de canal par rapport aux PAL conventionnel. La présente invention propose également une nouvelle zone de distance lointaine-intermédiaire et une meilleure stabilité verticale de la vision dans une zone de la lentille.

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