发明授权
- 专利标题: Concentric annular ring lens designs for astigmatism
- 专利标题(中): 用于散光的同心圆环透镜设计
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申请号: US433741申请日: 1995-05-04
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公开(公告)号: US5652638A公开(公告)日: 1997-07-29
- 发明人: Jeffrey H. Roffman , Edgar V. Menezes
- 申请人: Jeffrey H. Roffman , Edgar V. Menezes
- 申请人地址: FL Jacksonville
- 专利权人: Johnson & Johnson Vision Products, Inc.
- 当前专利权人: Johnson & Johnson Vision Products, Inc.
- 当前专利权人地址: FL Jacksonville
- 主分类号: G02B3/10
- IPC分类号: G02B3/10 ; G02C7/02 ; G02C7/04 ; G02C7/06 ; A61F2/16
摘要:
Concentric annular ring lens designs are disclosed for astigmatic patients, particularly lens designs which reduce the sensitivity of the patient to toric axis misalignment, thus reducing the required number of stock keeping units in inventory for a toric product. Several of the concentric annular ring lens designs comprise a multifocal concentric annular ring design on either the front or back surface and a toric curve on the reverse surface to correct for astigmatism. Alternating concentric annular rings divide the optical zone of the contact lens into regions having at least two optical powers, a first optical power corresponding to the refractive spherical component of a patient's basic prescription Rx, and a second optical power corresponding to the cylindrical power of a patient's basic prescription Rx, or a portion thereof, with an optional third intermediate optical power, such that the multifocus toric lens is rotationally desensitized because of the enhanced depth-of-field provided by the plurality of concentric annular rings. Some embodiments of the present invention have a spherical front or back surface wherein the opposite surface has a plurality of toric annular rings. Some embodiments of the present invention eliminate a toric surface, prism ballast and slab-off features, and provide spherical optical powers at the basic prescription Rx spherical power, the cylindrical power prescription Rx, and an intermediate optical power intermediate to the spherical and cylindrical optical powers.
信息查询
IPC分类:
G | 物理 |
G02 | 光学 |
G02B | 光学元件、系统或仪器 |
G02B3/00 | 简单或复合透镜 |
G02B3/10 | .双焦透镜;多焦透镜 |