| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide glasses which, with an aim to expand a field of upper front vision, enable a wearer to view a landscape or a situation by shifting a line of sight to an intended direction without forcing the wearer to change posture thereof and allow triangular prism lenses to be used as a detachable adaptor depending on an intended use and appropriateness of a prism diopter. <P>SOLUTION: A triangular prism is used as a spectacle lens. <P>COPYRIGHT: (C)2012,JPO&INPIT |
