Method of making protective filter lens
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United States of America Patent
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-
Apr 2, 2002
Issued Date -
N/A
app pub date -
Nov 16, 2000
filing date -
Sep 9, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ophthalmic, protective, filter lens, and a method of producing such lens, the lens having a ratio of Z and Y tristimulus values between 0.25-0.40, a dominant wavelength between 570-580 nm. on a color mixture diagram, a sharp transmission drop between 450-500 nm. and a transmission not over 30% between 400-450 nm. The lens is produced by firing a silver halide-containing, photochromic glass lens in a hydrogen-containing atmosphere within a temperature range of 465.degree. C. to 495.degree. C. for less than 20 minutes.
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