Method for determination of an ophthalmic lens using an...

G - Physics – 02 – C

Patent

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G02C 7/02 (2006.01)

Patent

CA 2534540

The invention relates to a method for determination by optimisation of an ophthalmic lens, taking into account not only the prescription of the wearer for far sight: strength, amplitude and axis of the astigmatism, but also the prescription of the wearer for near sight. Said near sight prescription is measured with binocular vision. The lens is thus defined by optimisation, using the prescription for strength and astigmatism for far sight and near sight as target. According to the invention, variations in astigmatism arising from viewing conditions can be accounted for, objects being generally further away for far sight than for near sight. Account can also be taken of variations in astigmatism caused by physiological deformations of the eye in the rotation thereof on passing from a primary viewing direction to a viewing direction adapted to near sight.

L'invention a pour objet un procédé de détermination par optimisation d'une lentille ophtalmique. Elle propose de tenir compte non seulement de la prescription du porteur en vision de loin - puissance, amplitude et axe de l'astigmatisme - mais aussi de la prescription du porteur en vision de près. Cette prescription en vision de près est mesurée en vision binoculaire. La lentille est alors définie par optimisation, en utilisant comme cible les prescriptions de puissance et d'astigmatisme en vision de loin et en vision de près. L'invention permet de tenir compte des variations d'astigmatisme découlant des conditions de visée - les objets étant généralement plus loin en vision de loin qu'en vision de près. Elle permet aussi de tenir compte des variations d'astigmatisme provoquées par les déformations physiologiques de l'oeil dans sa rotation pour passer d'une direction primaire du regard à une direction du regard adaptée à la vision de près.

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