Zonal diffractive trifocal intraocular lenses

摘要

The present invention generally provides multifocal ophthalmic lenses, e.g., trifocal intraocular lenses (80), that employ a central refractive region (18) for providing a refractive focusing power and a diffractive region (20) for providing two diffractive focusing powers. An ophthalmic lens (80), comprises an optic having a central refractive region (82a) for providing a refractive far-focus optical power, a diffractive structure (86) disposed on at least one surface of said optic for providing a diffractive near focusing power and a diffractive intermediate focusing power.