| 摘要 |
PROBLEM TO BE SOLVED: To increase the size of the near sight regions of multifocal lenses and to prevent the distortion in the right and left regions of the lenses. SOLUTION: The multifocal lens has an outer flank 21 and an inner flank 22 and is formed with at a far sight region 23 and the near sight region 24 on the outer flank. The outer flank has an outside surface TC axial degree 180 deg. and is changed in the thickness of the lens from the far sight region toward the near sight region according to the outside surface TC axial degree. More specifically, the thickness of the lens increases from the far sight region toward the near sight region according to the outside surface TC axial degree. At this time, the thickness of the lens is made constant in the far sight region.
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