Multifocal lens having a progressive optical power region...

G - Physics – 02 – C

Patent

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G02C 7/06 (2006.01)

Patent

CA 2680870

Embodiments of the present invention relate to a multifocal lens having a diffractive optical 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 ayant une région de puissance optique diffractive et une région de puissance optique progressive. Des modes de réalisation de la présente invention prévoient l'alignement et le positionnement corrects de chacune de ces régions, la quantité de puissance optique fournie par chacune des régions, la conception optique de la région de puissance optique progressive ainsi que la taille et la forme de chacune des régions. La combinaison de ces paramètres de conception permet une conception optique ayant un astigmatisme et une distorsion non souhaités inférieurs ainsi qu'une largeur de canal plus large et une longueur de canal plus courte par rapport à des PAL classiques. Des modes de réalisation de la présente invention peuvent également fournir une nouvelle zone de distance loin-intermédiaire inventive et peuvent en outre fournir une stabilité verticale accrue de vision dans une zone de la lentille.

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