发明名称 |
Multifocal spectacle lens having a large near-vision part |
摘要 |
The invention is directed to a multifocal spectacle lens having an especially large near-vision part. A supplementary component is fused into a base dimensioned for the near-vision range. The supplementary part is for at least one distance-vision range. In this connection, it is especially advantageous to select the refractive index of the base to be greater than the refractive index of the supplementary component. Compared to known multifocal lenses made in one piece, the multifocal lens of the invention avoids steps or substantial image jumps between the near-vision and distant-vision regions. For shortsighted wearers of spectacles, the lenses are thinner and therefore lighter.
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申请公布号 |
US4690524(A) |
申请公布日期 |
1987.09.01 |
申请号 |
US19850700392 |
申请日期 |
1985.02.11 |
申请人 |
CARL-ZEISS-STIFTUNG |
发明人 |
DANIELS, ERWIN J.;KORN, SIEGFRIED |
分类号 |
G02C7/06;(IPC1-7):G02C7/06 |
主分类号 |
G02C7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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