Artificial intraocular lens
AssigneeAmerican Optical Corporation
InventorsEmil W. Deeg, Robert E. Graf, David A. Krohn
Life of this patent
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Abstract
A chemically durable, inert optical implant lens and glass composition for the manufacture of same.
Claims10
A glass adaptable to use in the manufacture of artificial intraocular lenses consisting essentially of the following ingredients in the range of weight percent:
- ______________________________________ SiO.sub.2 38.1 to 38.7 TiO.sub.2 22.3 to 23.8 ZrO.sub.2 4.1 to 4.5 La.sub.2 O.sub.3 0 to 2.1 B.sub.2 O.sub.3 2.9 Fe.sub.2 O.sub.3 2.0 ZnO 1.7 CaO 1.0 SrO 1.2 MnO .1 to 2.0 BaO 3.5 to 5.0 Na.sub.2 O 18.6 CeO.sub.2 0.3 to 5 CuO 0 to .05 ______________________________________
- said glass having spectral transmission characteristics simulating the optical absorption of human crystalline lenses being of high chemical durability with freedom from toxicity and radioactivity, of low density from about 2.46 to 3.05 g/cc and having a coefficient of expansion (.degree.C.sup..sup.-1) approximately 40 .times. 10.sup..sup.-7.
A glass lens being of high chemical durability with freedom from toxicity and radioactivity, of low density from about 2.46 to 3.05 g/cc and having a coefficient of expansion (.degree.C.sup..sup.-1) approximately 40 .times. 10.sup..sup.-7 suitable for intraocular implantation and having spectral transmission characteristics simulating the optical absorption of human crystalline lenses wherein the composition of the glass consists essentially of the following ingredients in the range of weight percent:
- ______________________________________ SiO.sub.2 38.1 to 38.7 TiO.sub.2 22.3 to 23.8 ZrO.sub.2 4.1 to 4.5 La.sub.2 O.sub.3 0 to 2.1 B.sub.2 O.sub.3 2.9 Fe.sub.2 O.sub.3 0 to 2.0 ZnO 1.7 CaO 1.0 SrO 1.2 MnO .1 to 2.0 BaO 3.5 to 5.0 Na.sub.2 O 18.6 CeO.sub.2 0.3 to 5 CuO 0 to .05 ______________________________________
Dependencies are inferred from the claim text.