Zonal diffractive multifocal intraocular lenses

Details Zonal diffractive multifocal intraocular lenses Zonal diffractive multifocal intraocular lenses

A - Human Necessities

61

F

A61F 2/16 (2006.01) A61F 9/007 (2006.01)

Patent

CA 2640250

The present invention generally provides multifocal ophthalmic lenses, e.g., multifocal intraocular lenses, that employ a central refractive region for providing a refractive focusing power and a diffractive region for providing two diffractive focusing powers. In many cases, the refractive focusing power provided by the lens's central region corresponds to a far-focusing power that is substantially equal to one of the diffractive focusing powers while the other diffractive power corresponds to a near--focusing power. As such, in many cases, the focusing properties of the lenses are dominated by the far-focus ability, especially for small pupil sizes.

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