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US 2007/0182921 A1Published application
Pseudo-accommodative IOL having diffractive zones with varying areas
AssigneeAlcon Manufacturing, Ltd.
InventorsXiaoxiao Zhang, Steve VanNoy, Xin Hong
Life of this patent
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Abstract
In one aspect of the invention, a trifocal ophthalmic lens is disclosed that includes an optic having at least one optical surface, and a plurality of diffractive zones that are disposed on a portion of that surface about an optical axis of the optic. At least two of those diffractive zones have different areas so as to cause broadening of optical energy profiles at a near and a far foci of the diffractive zones for generating an intermediate focus.
Claims22
A multifocal ophthalmic lens, comprising
- an optic having at least one optical surface, and
- a plurality of diffractive zones disposed about an optical axis of the optic,
- at least two of said diffractive zones having different areas so as to cause
- broadening of optical energy profiles at a near and a far foci of said
- diffractive zones for generating an intermediate focus.
2 more elements
A multifocal ophthalmic lens, comprising
- an optic having a surface characterized by a base reference curve,
- a plurality of annular diffractive structures superimposed on a portion of
- said base curve about an optical axis of said optic,
- wherein a plurality of said diffractive structures exhibit varying widths so
- as to collectively provide near, intermediate and far vision.
2 more elements
A multifocal ophthalmic lens, comprising
- an optic having at least one optical surface, and
- at least two diffractive zones disposed on said surface, one of said zones
- having an area greater than an area of the other zone by a factor in a range
- of about 75% to about 200% such that the diffractive zones collectively
- provide near, intermediate and far vision.
2 more elements
Dependencies are inferred from the claim text.