Medium refractive index glass suitable for ophthalmic applicatio

Details Medium refractive index glass suitable for ophthalmic applicatio Medium refractive index glass suitable for ophthalmic applicatio

1988-06-23

1989-04-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 67, 501903, C03C 3089, C03C 3093, C03C 400

Patent

active

048227587

ABSTRACT:
This invention is related to glasses particularly useful in the fabrication of multifocal lenses for ophthalmic applications. The inventive glasses exhibit a refractive index between 1.599-1.602, an Abbe number between 40.5-41.5, a density between 2.64-2.66 g/cm.sup.3, a transmission of visible radiation at 400 nm through a thickness of 10 mm greater than 83%, a softening point between 670.degree.-680.degree. C., a birefringence upon sealing, measured as described, between -150 and +150 nm/cm, and consist essentially, expressed in terms of weight percent on the oxide basis, of:

REFERENCES:
patent: 2523265 (1954-09-01), Armistead
patent: 2699399 (1955-01-01), Armistead
patent: 2901365 (1959-08-01), Seymour et al.
patent: 4438211 (1984-03-01), Mennemann et al.
patent: 4444893 (1984-04-01), Mader
patent: 4540672 (1985-09-01), Boudot et al.
patent: 4562161 (1985-12-01), Mennemann et al.

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