PROBLEM TO BE SOLVED: To provide a multifocal ocular lens that ensures clear far vision and near vision even in a bright place where a pupil diameter becomes smaller, has a satisfactory field of view at an intermediate position between the far and near positions, and is appropriate to suppress degradation in imaging performance resulting from occurrence of flare.SOLUTION: A multifocal ocular lens has a ring band structure in which at least one surface is divided into a plurality of concentric circular refractive surfaces. The multifocal ocular lens has a step in a direction substantially horizontal to an optical axis between adjacent refractive surfaces. The height of the step satisfies a predetermined condition. Also, of the two refractive faces adjacent to each other, the refractive surface far from the optical axis is defined as an outside refractive surface, and the refractive surface close to the optical axis is defined as an inside refractive surface. In this case, the multifocal ocular lens is configured to have at least one structure in which the curvature radius of the outside refractive surface has a value between the curvature radius of the inside refractive surface and the curvature radius of a base-curve shape so as to become closer to the base-curve shape.COPYRIGHT: (C)2013,JPO&INPIT【課題】瞳孔径が小さくなるような明るい場所でも明瞭な遠方視及び近方視を担保するとともに、遠方と近方との中間位置の視野も良好で、かつフレアの発生に伴う結像性能の劣化を抑えるのに好適な多焦点眼用レンズを提供すること。【解決手段】少なくとも一面が同心円状の複数の屈折面に分割された輪帯構造を有し、互いに隣り合う屈折面の間に光軸に略水平な方向の段差が形成された多焦点眼用レンズであり、段差高さが所定の条件を満たすとともに、隣り合う二つの屈折面のうち、光軸から遠い側の屈折面を外側屈折面と定義し、光軸に近い側の屈折面を内側屈折面と定義した場合に、外側屈折面の曲率半径がベースカーブ形状に近付くように、内側屈折面の曲率半径とベースカーブ形状の曲率半径との間の値になっている構造を少なくとも1つ有するように構成した。【選択図】図4
