Contact lenses with off-center sphere surface

Details Contact lenses with off-center sphere surface Contact lenses with off-center sphere surface

G - Physics

02

C

G02C 7/04 (2006.01)

Patent

CA 2471856

The present invention provides a contact lens comprising a convex surface and a concave surface, one or both of the surfaces comprising: a) a central optical zone that is an aspherical sub-surface; b) a transition zone that is adjacent to said central optical zone, wherein and is a rotationally symmetric off-center sphere sub-surface; and c) a peripheral zone that comprises one or more sphere sub-surfaces, wherein all sub-surfaces are tangent to each other. By having a transition zone of the present invention, flexion points at the junction of optical zone with peripheral zone can be eliminated. The present invention also provides a method for producing a contact lens of the present invention.

La présente invention concerne une lentille de contact comprenant une surface convexe et une surface concave, au moins une de ces deux surfaces comprenant: a) une zone optique centrale qui est une sous-surface asphérique; b) une zone de transition qui est adjacente à ladite zone optique centrale et qui est une sous-surface sphérique décentrée symétrique par rotation; et c) une zone périphérique qui comprend une ou plusieurs sous-surfaces sphériques, toutes les sous-surfaces étant tangentes entre elles. La zone de transition selon la présente invention permet d'éliminer les points de flexion au niveau de la jonction de la zone optique avec la zone périphérique. Cette invention concerne également un procédé de production d'une lentille de contact selon la présente invention.

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