发明名称 |
Improvements in/or relating to ophthalmic lens manufacture. |
摘要 |
<p>A button for forming a segment of a multifocal lens, the button comprising a first portion (11) composed of a lead oxide-containing glass, a second portion (12) composed of a glass which contains substantially no lead oxide, the first and second portions being adjacent and forming a face of a button for machining to a desired shape, and a third portion (82) composed of a glass which contains substantially no lead oxide, the first and second glass portions being fused to the third glass portion on a side of the first and second portions remote from the said face of the button. The invention also provides a method of making a multifocal lens by (a) providing a button in accordance with the invention; (b) machining the said face of the button to the desired shape to match a recess in a lens blank; (c) disposing the button in the recess with the machined face adjacent to the face of the recess; (d) fusing the button in the recess; and (e) removing by grinding the third portion, and unwanted regions of the first and second portions so as to form a desired lens surface. <IMAGE></p> |
申请公布号 |
EP0592236(A1) |
申请公布日期 |
1994.04.13 |
申请号 |
EP19930308017 |
申请日期 |
1993.10.08 |
申请人 |
SOLA INTERNATIONAL HOLDINGS, LTD. |
发明人 |
NEAL, GEORGE H.;KELLEY, WILLIAM C. |
分类号 |
C03B23/22;G02C7/06;(IPC1-7):C03B23/22 |
主分类号 |
C03B23/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|