首页>
外国专利>
PROGRESSIVE POWER SEMI-FINISHED SPECTACLE LENS BLANKS FOR ASTIGMATIC PRESBYOPES
PROGRESSIVE POWER SEMI-FINISHED SPECTACLE LENS BLANKS FOR ASTIGMATIC PRESBYOPES
展开▼
机译:渐进式半成品近视眼镜镜片
展开▼
页面导航
摘要
著录项
相似文献
摘要
An optical lab is provided with a set of different progressive power semi-finished spectacle lens blanks for different combinations of base curve, add power, cylinder and axis, where each semi-finished lens blank in the set has an unfinished surface and a progressive surface with a particular base curve and a particular add power. The progressive surface has been designed to provide optimal optical performance of a lens one surface of which is the progressive surface and another surface of which is a toric surface of a particular non-zero cylinder and a particular axis. Given a prescription of an astigmatic presbyope, the optical lab will select from the set the appropriate semi-finished lens blank and will surface the unfinished surface with the appropriate toric surface so that the progressive power spectacle lens matches the prescription.
展开▼