Achromatic ophthalmic lenses

Details Achromatic ophthalmic lenses Achromatic ophthalmic lenses

G - Physics

02

C

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

Patent

CA 2260876

A compound ophthalmic lens (10) having improved chromatic aberration is provided which includes a polymerized resin superstrate lens (20) formed on a substrate lens (30). The chromatic dispersion characteristics of the resin (20), as well as its refractive index, are matched to the substrate lens (30) to obtain the desired Abbe number, lens power and thickness of the finished lens (10), and to render the interface between the substrate lens (30) and the superstrate lens (20) substantially invisible. The color dispersion of the substrate lens (30) is compensated for by the superstrate lens (20) which has a relatively low Abbe number and has an opposite power from the substrate lens (30).

Cette invention se rapporte à une lentille ophtalmique composée (10), à aberration chromatique réduite, qui est constituée d'une lentille sus-jacente en résine polymérisée (20) formée sur une lentille de support (30). On adapte les caractéristiques de dispersion chromatique de la résine (20), de même que son indice de réfraction, à celles de la lentille de support (30) de façon à obtenir le nombre de Abbe, la puissance et l'épaisseur souhaités de la lentille finie (10) et de façon à rendre sensiblement invisible l'interface entre la lentille de support (30) et la lentille sus-jacente (20). Ladite lentille sus-jacente, qui possède un nombre de Abbe relativement faible et une puissance opposée à celle de la lentille de support, compense la dispersion des couleurs de ladite lentille de support (30).

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