Ophthalmic lens

G - Physics – 02 – C

Patent

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G02C 7/02 (2006.01)

Patent

CA 2614910

An ophthalmic lens has a complex surface with a fitting cross, a progression meridian having a power addition greater than or equal to 1.5 diopters between far vision and near vision reference points. The complex surface has within a circle of radius 20 mm centred on the geometrical centre of the lens, a cylinder value normalized to the addition of less than 0.8, and a rebound of the sphere quantity normalized to the addition of less than 0.04 on said circle. The surface also has a progression length less than or equal to 14 mm, defined as the vertical distance between the fitting cross and the point on the meridian for which the mean sphere reaches 85% of the addition. The lens is suited to hypermetropic wearers with a good perceptual comfort in peripheral vision and good accessibility in near vision.

Lentille ophtalmique à surface complexe avec croix d'ajustement, méridien de progression à addition de puissance supérieure ou égale à 1,5 dioptrie entre vision lointaine et vision rapprochée et points de référence de vision rapprochée. La surface complexe comporte, dans un cercle de rayon de 20 mm centré sur le centre géométrique de la lentille, une valeur de cylindre normalisée à l'addition de moins de 0,8, et un rebond de la quantité de sphère normalisé à l'addition de moins de 0,4 sur le cercle considéré. La surface comporte également une longueur de progression inférieure ou égale à 14 mm, définie comme la distance verticale entre la croix et le point du méridien pour lequel la sphère moyenne atteint 85 % de l'addition. La lentille se prête à une utilisation par des sujets hypermétropes, avec un bon confort de perception dans la vision périphérique et une bonne accessibilité dans la vision rapprochée.

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