Radiation blockers for contact lenses
AssigneeCooperVision International Limited
InventorsWilliam Mitchell, Ian Gibson, Robert Andrew Broad, David Morsley, Katarzyna Piskorczyk, Laura Simpson
Life of this patent
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Abstract
A hydrogel contact lens formulation for forming the polymeric body of a hydrogel contact lens comprising: a first high energy visible light (HEVL) absorber comprising a benzotriazole moiety and a second different high energy visible light (HEVL) absorber comprising a benzotriazole moiety, and a hydrogel contact lens obtained from the polymerisation of the formulation.
Claims29
A hydrogel contact lens obtained from polymerization of a formulation, the formulation comprising:
- a high energy visible light (HEVL) absorber component consisting of a first high energy visible light (HEVL) absorber, and a second different high energy visible light (HEVL) absorber, wherein
- the first HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-chloro-2H-benzotriazole (UV28), and the second different HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-methoxy-2-benzotriazole (UV13),
- the first HEVL absorber is present in an amount of from 0.4% to 0.7% (wt/wt) of the formulation and the second different HEVL absorber is present in an amount of from 0.7% to 1.6% (wt/wt) of the formulation, and
- a total amount of HEVL absorbers present in the formulation is from 1.56% to 1.8% (wt/wt).
A hydrogel contact lens obtained from polymerization of a formulation, the formulation comprising:
- a high energy visible light (HEVL) absorber component consisting of a first high energy visible light (HEVL) absorber, and a second different high energy visible light (HEVL) absorber, wherein
- the first HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-chloro-2H-benzotriazole (UV28), and the second different HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-methoxy-2H-benzotriazole (UV13),
- the first HEVL absorber is present in an amount of from 0.5% to 0.7% (wt/wt) of the formulation and the second different HEVL absorber is present in an amount of from 0.7% to 1.6% (wt/wt) of the formulation, and
- a total amount of HEVL absorbers present in the formulation is from 1.2% to 2.0% (wt/wt).
A hydrogel contact lens obtained from polymerization of a formulation,
- the formulation comprising:
- a high energy visible light (HEVL) absorber component consisting of a first high energy visible light (HEVL) absorber, and a second different high energy visible light (HEVL) absorber, wherein
- the first HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-chloro-2H-benzotriazole (UV28), and the second different HEVL is 2-[2′-hydroxy-3′-tert-butyl-5′-(3″-methacryloyloxypropoxy)phenyl]-5-methoxy-2H-benzotriazole (UV13),
- the first HEVL absorber is present in an amount of from 0.4% to 0.7% (wt/wt) of the formulation and the second different HEVL absorber is present in an amount of from 0.7% to 1.6% (wt/wt) of the formulation, and
- a total amount of HEVL absorbers present in the formulation is from 1.1% to 2.0% (wt/wt), and
- at least 46% of light is blocked in the 380 nm to 450 nm range, and
- a yellowness index as determined by the ASTM E313-05 method is less than 6.0.
Dependencies are inferred from the claim text.