Methods for designing and making contact lenses having...

G - Physics – 02 – C

Patent

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

Patent

CA 2350804

A method for constructing a soft contact lens (20) having a prescribed power correction for focusing light on the retina (35) of an eye is described. The method provides a soft contact lens (20) that, when in place on the wearer's eye, is designed and manufactured to provide a substantially ellipsoidal anterior surface. In the method, an eye model (10) including a cornea, a crystalline lens and a retina is constructed. An analysis is performed using the preliminary soft contact lens (20) and eye model tracing light ray paths through the contact lens/eye system. The shape factor of the anterior contact lens surface (36) when applied to the anterior surface of the cornea (30) is varied to achieve a contact lens/eye system where a trace of light ray paths is optimized for sharpest focust by minimizing a retinal spot size of the rays.

L'invention concerne un procédé de fabrication de lentilles de contact souples (20) présentant une correction de puissance requise permettant de focaliser la lumière sur la rétine (35) d'un oeil. Le procédé selon l'invention permet d'obtenir une lentille de contact souple (20) qui, une fois en position sur l'oeil de l'utilisateur, est conçue et fabriquée pour présenter une surface antérieure sensiblement ellipsoïdale. Selon le procédé, un modèle oculaire (10) comprenant une cornée, une lentille cristalline et une rétine est construit. Une analyse est effectuée en utilisant la lentille de contact souple préliminaire (20) et des trajets de rayons de lumière traçant le modèle oculaire dans le système oeil/lentille de contact. Le facteur de forme de la surface de la lentille de contact antérieure (36) une fois appliquée à la surface antérieure de la cornée (30) varie pour donner un système oeil/lentille de contact dans lequel le tracé des trajets de rayons de lumière est optimisé pour assurer une mise au point la plus critique possible en réduisant la taille du point rétinal des rayons.

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