Oxygen permeable contact lens and method of manufacture...

G - Physics – 02 – C

Patent

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G02C 7/06 (2006.01) B29C 39/02 (2006.01) B29D 11/00 (2006.01) G02B 1/04 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2056266

An oxygen permeable bifocal contact lens which has a distance vision portion and a near vision portion is made from materials having differing refractive indexes. The near vision portion has a higher refractive index than the distance portion with a Dk of at least 10. The distance portion forms the major portion of the lens and is formed as a crosslinked copolymer with a refractive index of not more than 1.49 from monomeric materials which impart oxygen permeability to the finished lens, and the near vision portion similarly is formed as a crosslinked copolymer from a monomer mixture which includes one or more monomers at a concentration and with a refractive index such that the near vision portion has a refractive index of at least 1.54. The monomer of the near vision portion includes at least one vinyl monomer having a substituted aromatic ring structure to make the monomer bulky and ensure there is only a limited shrinkage on polymerization of such monomers and mixtures containing them.

Une lentille de contact bifocale perméable à l'oxygène ayant une partie de vision éloignée et une partie de vision rapprochée est faite de matériaux qui ont des indices de réfraction différents. La partie de vision rapprochée a un indice de réfraction plus élevé que la partie de vision éloignée avec un Dk d'au moins 10. La partie de vision éloignée constitue la plus grande partie de la lentille et est formée comme un copolymère réticulé avec un indice de réfraction n'excédant pas 1,49 à partir de matériaux monomériques qui donnent à la lentille finie sa perméabilité à l'oxygène, et la partie de vision rapprochée similairement est formée comme un copolymère réticulé à partir d'un mélange de monomères qui comprend un ou plusieurs monomères en concentration telle et ayant un indice de réfraction tel que la partie de vision rapprochée a un indice de réfraction d'au moins 1,54. Le monomère de la partie de vision rapprochée comprend au moins un monomère de vinyle ayant une structure à noyau aromatique de remplacement pour donner du volume au monomère et s'assurer que la polymérisation de tels monomères et des mélanges les contenant n'entraîne qu'un retrait limité.

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