NC grinding process for the circumferential edge and top facet of an ophthalmic lens
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United States of America Patent
Stats
-
Aug 10, 1999
Grant Date -
N/A
app pub date -
Nov 19, 1996
filing date -
May 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for N-C controlled grinding of the top facet of an ophthalmic lens comprising: determining the length of a circumference of an apex of a facet groove in a lens mount which will receive the lens, determining the length of the circumference of the apex of the top facet in the vicinity of the circumferential edge which is to be installed in the lens mount, comparing those lengths and determining whether the deviation in the length of the facet groove from the length of the top facet is within a preset limit. If it is not within the limit, changing the position of the Lop facet to be within the limit, determining a change value and then finish grinding the top facet using values selected from the comparison value or the change value. The data concerning the shape of the lens mount and of the optometric data of the lens wearer may be entered in the computer
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