| 摘要 |
PROBLEM TO BE SOLVED: To provide a design method of eyeglasses lens capable of designing a progressive refractive power lens for presbyopia correction so that the lens may exhibit the optimum optical performance when being incorporated in an eyeglasses frame having a large camber angle, such as a wraparound type frame. SOLUTION: A progressive addition surface as a reference is set, also, a design reference point is separately set on a far sight part and a near sight part, and refracting power of astigmatism canceling refractive power of astigmatism generated owing to the camber angle at the design reference point is separately added to the far sight part and the near sight part, the amount of aspherical surface addition for the optimum optical performance is obtained related to the whole object-side refracting surface or eyeball-side refracting surface. Further, prism refracting power canceling prism refraction generated owing to the camber angle of the eyeglasses frame at the design reference point is separately added to the far sight part and the near sight part. COPYRIGHT: (C)2009,JPO&INPIT
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