Increased stiffness center optic in soft contact lenses for astigmatism correction
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsAzaam Alli, Dola Sinha
Life of this patent
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Abstract
A molded contact lens comprising a stiffer optic zone relative to the peripheral zone of the contact lens provides an optical element for correcting astigmatism without the need for or substantially minimizing the need for the correction of rotational misalignment. The higher elastic modulus optic zone vaults over the cornea thereby allowing a tear lens to form. The tear lens follows or assumes the shape of the back surface of the contact lens. The combination of the tear lens and the optical zone provide an optical element for correction of refractive error.
Claims27
A contact lens comprising:
- an optic zone being formed from a first material having a first Young's modulus between about 1,000 psi and about 200,000 psi, said first material formed from a first reactive mixture comprising at least one N-alkyl methacrylamide and at least one macromer silicone-containing component;
- and
- a peripheral zone formed from a second material having a second Young's modulus less than about 200 psi.
A contact lens comprising:
- an optic zone having a first stiffness, said optic zone being formed from a first material having a first Young's modulus between about 1,000 psi and about 200,000 psi, said first material formed from a first reactive mixture comprising at least one N-alkyl methacrylamide and at least one macromer silicone-containing component;
- and
- a peripheral zone having a second stiffness formed from a second material having a second Young's modulus less than about 200 psi, the first stiffness being greater than the second stiffness.
Dependencies are inferred from the claim text.