Contact lenses having smoothly joined optical surfaces

Details Contact lenses having smoothly joined optical surfaces Contact lenses having smoothly joined optical surfaces

G - Physics

02

C

G02C 7/04 (2006.01)

Patent

CA 2493740

Apparatus, products, and methods are described that relate to blending various disparate optical surfaces in a smooth and continuous manner. In cross section, the two disparate surfaces are represented as meridional profiles. A blend zone profile is described by a single third-order polynomial. In the case of rotationally symmetric optics, one cross-section suffices for the description of the entire surface. In the case of non-rotationally symmetric optics, an increased number of cross-sections are necessary to produce the desired three-dimensional surface, thus meridional profiles are calculated at selected azimuthal locations to describe the full surface.

L'invention concerne un appareil, des produits et des procédés associés au mélange de différentes surfaces optiques disparates d'une manière unie et continue. En section transversale, les deux surfaces disparates sont représentées sous des profils de méridien. Un profil de zone de mélange est décrit par un polynôme unique du troisième degré. Dans le cas d'optiques à symétrie de rotation, une section transversale suffit à décrire la surface entière. Dans le cas d'optiques qui ne possèdent pas de symétrie de rotation, un nombre supérieur de sections transversales est nécessaire afin de produire la surface tridimensionnelle recherchée, les profils de méridien étant calculés à des emplacements azimutaux sélectionnés afin de décrire la surface complète.

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