| 摘要 |
To offer a novel combining formula for combining a progressive refractive surface and a toric surface, thereby to provide a novel progressive multifocal lens which has an eyesight correcting capability and an astigmia remedying capability on an identical refractive surface. Using a combining formula indicated by a combining formula (1) or (2), a refractive surface 2 on an eyeball side or a refractive surface 3 on an object side is made a combined refractive surface 14+15 in which an original progressive refractive surface 14 set only for the purpose of demonstrating a desired eyesight-correcting characteristic, and an original toric surface 15 set only for the purpose of demonstrating a desired astigmia-remedying characteristic are combined.
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