Toric contact lens with improved posterior surface design

Details Toric contact lens with improved posterior surface design Toric contact lens with improved posterior surface design

G - Physics

02

C

G02C 7/04 (2006.01)

Patent

CA 2695516

Ophthalmic lenses for correcting astigmatism having a posterior surface with a central optic zone, a peripheral zone, and a blending zone therebetween. The surface of the central zone may be asphero-toric and the surface of the peripheral zone aspheric, with these flatter slopes smoothening out the transition between the central and peripheral zones. The blending zone gradually transitions the curvatures of the central and peripheral zones to further smoothen out the central-to-peripheral-zone transition.

L'invention concerne des lentilles ophtalmiques pour corriger un astigmatisme ayant une surface postérieure avec une zone optique centrale, une zone périphérique et une zone de flexion entre celles-ci. La surface de la zone centrale peut être asphéro-torique et la surface de la zone périphérique asphérique, ces pentes plus plates aplanissant la transition entre les zones centrale et périphérique. La zone de flexion réalise une transition progressive entre les courbures des zones centrale et périphérique pour aplanir davantage la transition de zone centrale-périphérique.

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