| 摘要 |
PCT No. PCT/JP97/00436 Sec. 371 Date Jun. 4, 1998 Sec. 102(e) Date Jun. 4, 1998 PCT Filed Feb. 19, 1997 PCT Pub. No. WO97/31285 PCT Pub. Date Aug. 28, 1997There is provided a multifocal contact lens having a lens curve formed by altermately arranging a plurality of curved surfaces for far vision and a plurality of curved surfaces for near vision in the form of concentric zones, and a die for forming the contact lens, and a method for producing the contact lens. Each of the curved surfaces (F1, F2, . . . ) for far vision of the lens curve (2) has a center (OF1, OF2, . . . ) of curvature on an optical axis and a radius (RF1, RF2, . . . ) of curvature, which is set so that a ray being incident on the corresponding curved surface and being parallel to the optical axis forms an image at a location near a single focal point (FF) for far vision on the optical axis, and each of the curved surfaces (N1, N2, . . . ) for near vision of the lens curve (2) has a center (ON1, ON2, . . . ) of curvature on the optical axis and a radius (RN1, RN2, . . . ) of curvature, which is set so that a ray being incident on the corresponding curved surface and being parallel to the optical axis forms an image at a location near a single focal point (FN) for near vision on the optical axis.
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