Systems and Methods for Producing Silicone Hydrogel Contact Lenses From a Polymerizable Composition
First Claim
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1. A method of producing a silicone hydrogel contact lens, comprising:
- exposing a contact lens mold assembly, comprising a silicone hydrogel lens precursor composition, to ultraviolet light at an ultraviolet light intensity effective in forming a polymerized silicone hydrogel contact lens, characterized in thatthe ultraviolet light intensity measured at a surface of the contact lens mold assembly is greater than 20 μ
W/cm2 and less than 4000 μ
W/cm2.
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Abstract
Systems and methods of manufacturing ophthalmic lenses, for example, silicone hydrogel contact lenses, are provided. The present systems and methods provide certain amounts of ultraviolet light to contact lens mold assemblies that comprise a silicone hydrogel precursor composition. For example, the systems and methods may provide ultraviolet light at an intensity from 20 μW/cm2 to 4000 μW/cm2. The ultraviolet light intensity can be provided as substantially uniform levels to provide consistent curing for batches of silicone hydrogel contact lenses.
60 Citations
23 Claims
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1. A method of producing a silicone hydrogel contact lens, comprising:
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exposing a contact lens mold assembly, comprising a silicone hydrogel lens precursor composition, to ultraviolet light at an ultraviolet light intensity effective in forming a polymerized silicone hydrogel contact lens, characterized in that the ultraviolet light intensity measured at a surface of the contact lens mold assembly is greater than 20 μ
W/cm2 and less than 4000 μ
W/cm2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for producing a silicone hydrogel contact lens, comprising:
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an ultraviolet light source that provides ultraviolet light to a contact lens mold assembly, comprising a silicone hydrogel lens precursor composition, at an ultraviolet light intensity to form a polymerized silicone hydrogel contact lens, characterized in that the ultraviolet light intensity measured at a surface of the contact lens mold assembly is greater than 20 μ
W/cm2 and less than 4000 μ
W/cm2. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification