• Patent Title: Ophthalmic diffractive multi-focal lens and method for manufacturing ophthalmic diffractive multi-focal lens
  • Application No.: US16074617
    Application Date: 2016-02-09
  • Publication No.: US11009723B2
    Publication Date: 2021-05-18
  • Inventor: Ichiro Ando
  • Applicant: MENICON CO., LTD.
  • Applicant Address: JP Nagoya
  • Assignee: MENICON CO., LTD.
  • Current Assignee: MENICON CO., LTD.
  • Current Assignee Address: JP Nagoya
  • Agency: Oliff PLC
  • International Application: PCT/JP2016/053874 WO 20160209
  • International Announcement: WO2017/138099 WO 20170817
  • Main IPC: G02C7/04
  • IPC: G02C7/04 G02B5/18 G02C7/02 A61F2/16
Ophthalmic diffractive multi-focal lens and method for manufacturing ophthalmic diffractive multi-focal lens
Abstract:
Provided is an ophthalmic diffractive multi-focal lens with a diffractive structure including a phase profile in which a plurality of blaze shaped zones are set in a concentric circle form, wherein: at least one of the zones serves as an adjustment zone wherein an inclination direction in the phase profile is reversed with respect to that of other zones; and a light intensity level giving a peak or focal point at a position away from three focal points in a light intensity distribution of transmitted light in an optical axis direction is kept low in comparison with a phase profile without the adjustment zone.
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