Ophthalmic lens with multiple phase plates

Abstract From the Canadian patent

An ophthalmic lens for providing a plurality of foci has an optic comprising an anterior surface, a posterior surface and an optical axis. The optic has a , first region and a second region. The first region has a refractive optical power and comprises a multifocal phase plate for forming a first focus and a second focus. The second region has a refractive optical power and comprises a monofocal phase plate for forming a third focus. The multifocal phase plate and the monofocal phase plate may be disposed on first and second base curvatures, respectively, that may have different radii of curvature. The ophthalmic lens may also have an intermediate phase plate located between the …