| CPC A61F 2/1618 (2013.01) [A61F 2/164 (2015.04)] | 11 Claims |
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1. An intraocular lens comprising a lens part, wherein:
the lens part includes regions each having a circular or ring shape, the regions being disposed concentrically around an axis of the lens part,
the regions in the lens part include:
a first region that is a circular region located at the centermost position, a first refractive power being uniform in the first region regardless of the distance from the axis,
a second region that is a ring-shape region located adjacent to the first region at an outer side of the first region, the second region having a refractive power that is increased or decreased from the first refractive power as the distance from the axis becomes larger, and
an outer region that is a ring-shape region located at an outer side of the second region, the outer region having a reference refractive power for focusing on a far point,
an MTF curve at spatial frequency of 50 lp/mm relating to light passing through a region having a radius of 1.5 mm around the axis of the lens part has one maximal value and no minimal value in a range of a defocusing value of −0.5 D to 0.5 D, and
a change rate of an area of the second region relative to an area of the first region is within a range of ±50%.
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