Method of producing angular tolerance markings for lenses for correcting astigmatism, and associated lenses
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 11, 2000
Grant Date -
N/A
app pub date -
Apr 7, 1999
filing date -
Apr 7, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method of producing tolerance markings on a contact lens for correcting astigmatism which has a given cylinder, the tolerance markings comprise at least two straight line segments in the peripheral part of the contact lens with an angle 2.alpha..sub.T between them. The angle 2.alpha..sub.T between the two straight line segments of the tolerance markings depends on the cylinder of the contact lens.
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