Colorless ophthalmic glasses

Details Colorless ophthalmic glasses Colorless ophthalmic glasses

C - Chemistry, Metallurgy

03

C

C03C 3/093 (2006.01) C03C 3/095 (2006.01) G02B 1/00 (2006.01)

Patent

CA 2163497

This invention is directed to the production of glasses useful for ophthalmic applications which exhibit excellent resistance to the development of coloration upon being exposed to x-radiation and excellent resistance to the development of solarization. The glass compositions are essentially free of lead and consist essentially, in weight percent, of SiO2 60-70 ZrO2 0.5-2 TiO2 0-1.5 B2O3 0.5-5 CeO2 0.1-0.3 Sb2O3 0-0.5 B2O3 2-6 Li2O 0-2 SO3 0-0.3 Na2O 9-14 MgO 0-5 Br 0-0.5 K2O 3-10 SrO 0-5 Cl 0-0.5 CaO 0.5-4 BaO 0-5 F 0-0.5 . ZnO 3-9

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