首页>
外国专利>
Method for Designing Group of Bi-Aspherical Type Progressive-Power Lenses, and Group of Bi-Aspherical Type Progressive-Power Lenses
Method for Designing Group of Bi-Aspherical Type Progressive-Power Lenses, and Group of Bi-Aspherical Type Progressive-Power Lenses
展开▼
机译:双非球面渐进屈光力镜片组的设计方法及双非球面渐进屈光力镜片的组
展开▼
页面导航
摘要
著录项
相似文献
摘要
There is provided a group of bi-aspherical type progressive-power lenses for which the processing costs are reduced. In a bi-aspherical type progressive-power lens(es), the relationships DHf+DHnDVf+DVn and DHnDVn or further, DVn−DVfADD/2 and DHn−DHfADD/2 are satisfied; DHf and DVf are designated respectively as a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction at a far vision power measurement position F1 on a first refractive surface that acts as an object-side surface; with DHn and DVn are designated respectively as a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction at a near vision power measurement position N1 on the first refractive surface; a surface astigmatism component at F1 and N1 of the first refractive surface is canceled by a second refractive surface of the eye-side surface; and the first and second refractive surfaces are combined to provide a far vision power (Df) and an addition (ADD) on the basis of a prescription; wherein the same first refractive surface is used for at least two or more kinds of different addition power.
展开▼