Toric ophthalmic lenses having selected spherical aberration...

G - Physics – 02 – C

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G02C 7/04 (2006.01) A61F 2/16 (2006.01)

Patent

CA 2738901

A toric ophthalmic lens having substantially zero spherical aberration for a first circular aperture having a first diameter and substantially zero spherical aberration for a second circular aperture having a second diameter, the first diameter being at least 4 mm and the second diameter being at least 3 mm, the first diameter being at least 0.5 mm larger than the second diameter. A series of ophthalmic lenses, each lens comprising a same spherical power as the other lenses in the set, and a unique cylindrical power, each lens comprising (i) a first toric surface, and (ii) a second surface, at least one of the first surface and the second surface being aspheric in a meridian, the lens having substantially zero spherical aberration for all circular optical zone diameters less than 4 mm.

La présente invention concerne une lentille ophtalmique torique présentant une aberration sphérique sensiblement nulle pour une première ouverture circulaire ayant un premier diamètre et une aberration sphérique sensiblement nulle pour une seconde ouverture circulaire ayant un second diamètre, le premier diamètre étant dau moins 4 mm et le second diamètre étant dau moins 3 mm, le premier diamètre étant plus grand que le second diamètre dau moins 0,5 mm. Linvention concerne également une série de lentilles ophtalmiques, chaque lentille ayant une même puissance sphérique que les autres lentilles de lensemble, et une puissance cylindrique unique, chaque lentille comprenant (i) une première surface torique et (ii) une seconde surface, la première surface et/ou la seconde surface étant asphériques dans un méridien, la lentille présentant une aberration sphérique sensiblement nulle pour tous les diamètres de zones optiques circulaires inférieurs à 4 mm.

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