Ophthalmic lenses capable of reducing chromatic aberration

G - Physics – 02 – C

Patent

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G02C 7/02 (2006.01) A61F 2/16 (2006.01) G02B 5/18 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2562268

A method of designing an aspheric ophthalmic lens with both refractive and diffractive powers that is capable of reducing chromatic aberration and at least one monochromatic aberration of an eye comprises combining aspherical refractive and diffractive surfaces, selecting an appropriate eye model, establishing a design lens having at least one aspheric surface with a capacity to reduce monochromatic aberration in said eye model, establishing a diffractive lens element that corrects for chromatic aberration of the model eye; and adjusting the lens surface design in order to obtain a suitably high polychromatic image quality in a form that is weighted to comply with a spectral merit function.

L'invention concerne un procédé de conception d'un verre ophtalmique asphérique à pouvoirs de réfringence et de diffraction qui peut réduire l'aberration chromatique et au moins une aberration monochromatique d'un oeil. Ce procédé consiste : à combiner des surfaces asphériques de réfringence et de diffraction ; à sélectionner un modèle oculaire approprié ; à établir un verre qui présente au moins une surface asphérique pouvant réduire l'aberration monochromatique d'un oeil dans ledit modèle oculaire ; à établir un élément de verre de diffraction qui corrige l'aberration chromatique dudit modèle oculaire ; et à ajuster la conception de la surface du verre afin d'obtenir une qualité d'image polychromatique convenablement élevée, pondérée pour permettre de répondre à une fonction de mérite spectrale.

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