Patent ID: 9320594
Filing Date: 2016-04-26
CPC Classification: A61F,G02B,G02C

Claim Text:
1. A diffractive multifocal lens comprising an optical element having a first diffracted optical surface having a single radial surface profile comprising a plurality of concentric annular zones concentric with a central zone and assignable, from the outer edge of the central zone to the edge of the lens, as alternating odd and even numbered zones each having a projected surface area, wherein the optical thickness of the lens changes monotonically within each zone, a distinct step in optical thickness occurs at the junction between the zones, the height of the steps differs between at least some adjacent zones, and a pattern of step height differences between two or more adjacent zones repeats periodically from the center to the edge of the lens so as to tailor diffraction order efficiencies of three consecutive orders of the single radial surface profile of the optical element.