发明名称 |
Simultaneous vision optical lens for correcting presbyopia |
摘要 |
The proximity P of a simultaneous vision optical lens for correcting presbyopia is defined as the reciprocal of the distance D at which a light ray parallel to and at a distance h from its axis crosses the axis after passing through the lens. The curve representing the proximity P of the lens lies between a lower envelope curve Pinf and an upper envelope curve Psup satisfying the following equations: Pinf=f(h)=( SIGMA A'i hi)+PVL Psup=f(h)=( SIGMA A''i hi)+PVL in which PVL is the proximity for distant vision and A'i, A''i are numeric coefficients depending on the proximity addition added for near vision to the proximity for far vision. The lens may be implemented as a contact lens, an intra-ocular implant or an intra-corneal lens.
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申请公布号 |
US4976534(A) |
申请公布日期 |
1990.12.11 |
申请号 |
US19900468282 |
申请日期 |
1990.01.22 |
申请人 |
ESSILOR INTERNATIONAL, CIE GENERALE D'OPTIQUE |
发明人 |
MIEGE, CHRISTIAN;MONTEIL, PIERRE;OBRECHT, GERARD |
分类号 |
A61F2/14;A61F2/16;G02C7/04;G02C7/06 |
主分类号 |
A61F2/14 |
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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