Lenses and spectacles bearing lenses

G - Physics – 02 – C

Patent

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Details

G02C 7/02 (2006.01) A61F 9/02 (2006.01) G02C 7/08 (2006.01) G02C 7/10 (2006.01) G02C 7/12 (2006.01)

Patent

CA 2269324

An ophthalmic article inlcuding a first lens element having a front and rear surface; and a complementary lens element capable of bearing a prescription (Rx) surface having a front surface so shaped to closely approach at least a portion of the rear surface of the first lens element; the complementary lens element providing at least a portion of the refractive power required by the wearer; the ophthalmic article remaining substantially free of optical distortion. Also, the application discloses an optical lens element including a front and back surface, at least one surface being continuous, and forming a prescription (Rx) zone and optionally a non-prescription peripheral temporal zone, at least one surface exhibiting a change of base curve across the field of vision of the wearer; the front and/or back surface bearing a surface correction to at least partially adjust for optical errors. A method of designing the lens element is also disclosed.

L'invention concerne un article ophtalmique. Cet article comprend un premier verre comportant une surface avant et une surface arrière; et un verre complémentaire pouvant supporter une surface prescrite (Rx) par ordonnance, pourvue d'une surface avant formée de manière à être placée près d'au moins une partie de la surface arrière du premier verre. Le verre complémentaire présente au moins une partie de la puissance de réfraction requise par l'utilisateur. Cet article ophtalmique est sensiblement dépourvu de toute distorsion optique. En outre, l'invention traite également d'un élément optique comportant une surface avant et une surface arrière, au moins une surface étant continue, et formant une zone prescripte (Rx) par ordonnance, et éventuellement une zone temporale périphérique non prescrite. Au moins une surface présente un changement de courbe de base dans le champ de vision de l'utilisateur. La surface avant et/ou arrière supporte une correction de surface pour compenser, au moins partiellement, les erreurs optiques. L'invention traite d'un procédé de conception de verre de ce type.

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