Ophthalmic lens element

G - Physics – 02 – C

Patent

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G02C 7/04 (2006.01)

Patent

CA 2703452

An ophthalmic lens element is disclosed. The lens element includes a front surface and a rear surface, at least one which includes a horizontal meridian and a vertical meridian. A central region of the lens element includes a foveal vision zone providing a first power for providing clear foveal vision for a wearer. A peripheral region of positive power relative to the first power is also included. The peripheral region includes dual progressive zones located bilaterally of the vertical meridian and extending radially outwardly from the central region. The lens element provides a distribution of surface astigmatism which provides, on the horizontal meridian, a relatively low surface astigmatism in the central region and the progressive zones.

L'invention concerne un élément de lentille ophtalmique. L'élément de lentille comporte une surface avant et une surface arrière, dont au moins une comporte un méridien horizontal et un méridien vertical. Une région centrale de l'élément de lentille comporte une zone de vision fovéale fournissant une première énergie destinée à apporter une vision fovéale claire à un utilisateur. Une région périphérique d'énergie positive par rapport à la première énergie est également incluse. La région périphérique comporte deux zones progressives positionnées des deux côtés du méridien vertical et s'étendant radialement vers l'extérieur depuis la région centrale. L'élément de lentille assure une distribution d'astigmatisme de surface qui fournit, sur le méridien horizontal, un astigmatisme de surface relativement faible dans la région centrale et les zones progressives.

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