| 摘要 |
PROBLEM TO BE SOLVED: To provide a spectacle lens capable of enlarging a clear vision region in an intermediate portion between a far-sight portion and a near-sight portion, and reducing possibility of degrading an appearance of a wearer.SOLUTION: A spectacle lens 1 is configured in such a manner that: an outer surface 2 is a progressive refractive plane including a far-sight region 21 in an upper portion, a near-sight region 22 in a lower portion, and a progressive region 23 between the far-sight region 21 and the near-sight region 22; an inner surface 3 is a bifocal plane including a far-sight refractive power plane 31 in an upper portion and a near-sight refractive power plane 32 in a lower portion; the far-sight refractive power plane 31 and the near-sight refractive power plane 32 are in contact with each other only at one point-like coupling portion 33; vertical gradients of the far-sight refractive power plane 31 and the near-sight refractive power plane 32 at the coupling portion 33 are the same; a portion between the far-sight refractive power plane 31 and the near-sight refractive power plane 32 is a curved interpolation plane 34 that smoothly connects the far-sight refractive power plane 31 and the near-sight refractive power plane 32; the coupling portion 33 is disposed to overlap a middle position in the progressive region 23 in a view along a front-rear direction; and an addition on the progressive refractive plane is controlled to be larger than an addition on the bifocal plane.SELECTED DRAWING: Figure 1 |
