Toric surfacecasting

G - Physics – 02 – C

Patent

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Details

G02C 7/02 (2006.01) B29D 11/00 (2006.01) G02C 7/06 (2006.01)

Patent

CA 2217274

. An optical preform has a predetermined spherical curve on a concave surface of the optical preform a predetermined spherical curve on a convex surface of the optical preform and a near add power. A thin resin is applied to the concave surface of the optical preform and molded to form a toric layer by a mold having a toric convex mold surface. The resin layer is then cured and the mold removed to form a finished ophthalmic lens.

Cette invention concerne une méthode de fabrication d'une préforme optique caractérisée par une courbure sphérique prédéterminée côté concave, une courbure sphérique prédéterminée côté convexe et une puissance d'addition de vision de près. Une mince couche de résine est appliquée sur la surface concave de la préforme et moulée pour former une couche torique au moyen d'un moule à surface convexe torique. La couche de résine est alors réticulée et le moule enlevé pour donner une lentille correctrice finie.

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