| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a bifocal lens capable of preventing spoiling of an appearance of a wearer by eliminating a clear border line between a close range section and a distant range section as well as preventing jumping of images. <P>SOLUTION: A bifocal lens 10 has a distant range refractive power surface 1 in a top section and a close range refractive power surface 2 in a bottom section, either on a front surface or a back surface. The distant range refractive power surface 1 and the close range refractive power surface 2 come into contact only at one punctuate connecting section 3. In addition, the inclinations of the distant range refractive power surface 1 and the close range refractive power surface 2 in a vertical direction at the connecting section 3 are made identical. A curved surface interpolation surface 6 smoothly connecting the distant range refractive power surface 1 and the close range refractive power surface 2 exists in between the distant range refractive power surface 1 and the close range refractive power surface 2. <P>COPYRIGHT: (C)2013,JPO&INPIT |
