High refractive index glasses, multifocal corrective lenses containing same
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United States of America Patent
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Sep 4, 2001
Grant Date -
N/A
app pub date -
Apr 7, 2000
filing date -
Oct 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to glasses of high refractive index having the following composition of oxides, expressed in percentages by weight: SiO.sub.2 29-35, B.sub.2 O.sub.3 0.5-5, Li.sub.2 O 0.5-3, Na.sub.2 O 4-8, K.sub.2 O 0-2, PbO 28-40, BaO 4-14, La.sub.2 O.sub.3 4-12, TiO.sub.2 3-8, ZnO 0-8, ZrO.sub.2 0-4, Nb.sub.2 O.sub.5 0-5, with: Li.sub.2 O+Na.sub.2 O+K.sub.2 O 5.5-9; their use for the production of segments for multifocal corrective lenses; and multifocal corrective lenses incorporating at least one such segment in their structure.
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