| 摘要 |
PROBLEM TO BE SOLVED: To provide a spectacle lens for astigmatism correction with which distortion aberration can be balanced. SOLUTION: A toric surface as an astigmatism correction surface is formed on an object side (outside surface) of the lens and a toric surface as an astigmatism correction surface is also formed on the surface (inside surface) on the eyeball side of the lens. The direction where the curvature on the outside surface is maximized on these astigmatism correction surfaces is so set as to coincide with the direction where the curvature on the inside surface is maximized. As a result, the spectacle lens for astigmatism correction with which the distortion aberrations are balanced more satisfactorily than heretofore can be provided. COPYRIGHT: (C)2006,JPO&NCIPI
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