发明名称 |
Opthalmic Lenses Having Reduced Base Out Prism |
摘要 |
The invention generally relates to a lens and the method of manufacturing progressive addition lenses (PAL) to remove unwanted base out prism and minimize excessive convergence, comprising determining basic configuration of two major lens surfaces to provide a distance portion and near portion, wherein diopter power increases from the distance portion of the lens to the near portion; selecting an amount of prism reduction; and reducing base out prism that inherently occurs as diopter power increases by altering the configuration of the lens as a function of the amount of prism reduction to minimize any disruption of optical properties a lens while decreasing base out prism. |
申请公布号 |
US2012019774(A1) |
申请公布日期 |
2012.01.26 |
申请号 |
US201113214615 |
申请日期 |
2011.08.22 |
申请人 |
KRALL JEFFREY P.;MCLOUGHLIN HUGH;STEELE TREVOR;WHALE ANDREW;CROSSBOWS OPTICAL LIMITED |
发明人 |
KRALL JEFFREY P.;MCLOUGHLIN HUGH;STEELE TREVOR;WHALE ANDREW |
分类号 |
G02C7/06;G02C7/02 |
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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