B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 11/00 (2006.01) G02C 7/04 (2006.01)
Patent
CA 2378359
A method is provided which is used to design soft contact lens via corneal topographic analysis. The topography of the cornea is matched to a corresponding topography of a soft contact lens. A geometrical transformation which maps the corneal elevation onto the back surface of an unflexed soft contact lens is used to minimize errors induced by flexure of the lens. The mapping transformation takes into account the effects of flexure. As a result, the contact lens has a back surface with a curvature which matches the specific elevations of the cornea, while the front surface can be spherical or any desired symmetrical or asymmetrical shape.
L'invention concerne un procédé de conception de lentilles de contact souples via une analyse cornéenne topographique. La topographie de la cornée correspond à une topographie correspondante d'une lentille de contact souple. On utilise une transformation géométrique correspondant aux données d'élévation cornéenne sur la surface arrière d'une lentille de contact non courbée, afin de réduire les erreurs induites par la courbure de la lentille. La transformation de correspondance prend en compte les effets de la courbure. En conséquence, la lentille de contact possède une surface arrière à courbure correspondant aux données d'élévations spécifiques de la cornée, alors que la surface avant peut être sphérique ou d'une forme symétrique ou asymétrique désirée.
Collins Michael J.
Davis Brett A.
Iskander Daoud R.
Roffman Jeffrey H.
Ross Denwood F. III
Johnson & Johnson Vision Care Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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