Ophthalmic lens

Details Ophthalmic lens Ophthalmic lens

G - Physics

02

C

G02C 7/06 (2006.01) G02C 7/02 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2110393

An ophthalmic lens has front and rear optical surfaces, a central optical axis substantially perpendicular to the lens and comprises a plurality of concentric, contiguous circular refractive bands provided on at least one of the front and rear optical surfaces. The bands have a continuous cross-section in the shape of a segment of an ellipse having a given major axis length and eccentricity. The bands are of a given optical power to focus light on the focal plane. The major or the minor axis of each ellipse segment intersects the central optical axis and the focal plane. The bands are continuous at their boundaries between neighboring ones of the bands. The entire optical surface of the lens may be used with minimal distortion caused by the intersections of the continuous bands. The lens may be multifocal or monofocal, and can reduce the lens thickness.

Une lentille ophtalmique se compose de surfaces optiques avant et arriSre, d'un axe optique central sensiblement perpendiculaire . la lentille et comprend une pluralit' de bandes r'fringentes circulaires contigu%s et concentriques sur au moins une des surfaces optiques avant et arriSre. Les bandes possSdent une section transversale continue en forme de segment d'ellipse dont l'excentricit' et la longueur du grand axe sont donn'es. Les bandes ont une puissance optique donn'e pour permettre de focaliser la lumiSre sur le plan focal. Le grand axe ou le petit axe de chaque segment elliptique entrecoupe l'axe optique central et le plan focal. Les bandes sont continues au niveau de leurs limites avec des bandes voisines. La surface optique totale de la lentille peut ¬tre utilis'e avec une distorsion minimale, provoqu'e par les intersections des bandes continues. La lentille peut ¬tre multifocale ou monofocale et son 'paisseur peut ¬tre r'duite.

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