Method for determination of an ophtalmic lens

G - Physics – 02 – C

Patent

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G02C 7/06 (2006.01)

Patent

CA 2633279

The subject of the invention is a method for determination by optimization of an ophthalmic lens for a wearer for whom a power addition has been prescribed. The method proposes using as a target for the optimization of the lens, under wearing conditions, a difference of the mean orientation of the axes of resulting astigmatism to the vertical of less than 2.5° in a first control zone delimited by an ellipse centred on the progression meridian at half height between the fitting cross and the near vision reference point, said ellipse having a major axis greater than 35° and a minor axis comprised between 3.8° and 4.5°. The invention allows improvement in the performances of the progressive multifocal lenses in intermediate vision.

La présente invention concerne un procédé de détermination, par optimisation, d'une lentille ophtalmique destinée à un utilisateur auquel a été prescrite une augmentation de puissance. Le procédé implique d'utiliser en tant que cible permettant d'optimiser la lentille, dans des conditions d'utilisation, une différence de l'orientation moyenne des axes de l'astigmatisme résultant par rapport à la verticale qui est inférieure à 2,5° dans une première zone de référence délimitée par une ellipse centrée sur le méridien de progression à mi-hauteur entre la croix d'ajustement et le point de référence de vision proche, ladite ellipse ayant un grand axe supérieur à 35° et un petit axe compris entre 3,8 et 4,5°. Cette invention permet d'améliorer les qualités et l'efficacité des lentilles multifocales progressives pour la vision à distance moyenne.

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