Toric contact lens markings

Details Toric contact lens markings Toric contact lens markings

G - Physics

02

C

G02C 7/04 (2006.01) B29D 11/00 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2274763

Toric contact lenses are provided with markings (70, 80) that enable identification of the offset between the cylindrical axis (60) of the toric zone and the ballast axis (61). Surfaces of the lenses include two markings, a first identifiable marking (71) that is aligned with the cylindrical axis, and a second identifiable marking that is aligned with the ballast axis (81). The markings can be produced by using a mold with raised portions or by etching with laser radiation.

On forme sur des lentilles cornéennes toriques des repères (70, 80) permettant d'identifier le décalage entre l'axe du cylindre (60) de la zone torique et l'axe du contrepoids (61). La surface des lentilles comporte deux repères: un premier repère identifiable (71) aligné avec l'axe du cylindre, et un deuxième repère identifiable (81) aligné avec l'axe du contrepoids. Les repères sont formés soit à l'aide d'un moule présentant des parties en surélévation, soit par gravure au laser.

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