Increased stiffness center optic in soft contact lenses for astigmatism correction

Patent metadata

Field	Value
Publication number	US-2016313571-A1
Application number	US-201615203414-A
Country	US
Kind code	A1
Filing date	Jul 6, 2016
Priority date	Mar 27, 2012
Publication date	Oct 27, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . An ophthalmic device comprising:
a contact lens having a central optic zone and a peripheral zone surrounding the central optic zone, the contact lens being formed from a first material having a first Young's modulus; and a second material incorporated into the central optic zone of the contact lens, the second material having a Young's modulus of at least about 1000 psi and a water content of at least about 10%, formed from a second reactive mixture comprising at least one N-alkyl methacrylamide and at least one silicone-containing component.

2 . The ophthalmic device of claim 1 wherein said second material further comprising a water content of about 20 to about 40%.

3 . The ophthalmic device of claim 1 or 2 wherein said second reactive mixture further comprises at least one photoinitiator.

4 . The ophthalmic device of claim 1 wherein said silicone hydrogel is cured via exposure to light, or visible light.

5 . The ophthalmic device of any of the foregoing claims wherein said silicone containing component comprises at least one silicone chain having 3-30, 3-25, 3-20 or 3-15 siloxane repeating units.

6 . The ophthalmic device of claim 5 wherein said at least one silicone chain is a polydialkyl siloxane chain.

7 . The ophthalmic device of claim 5 wherein said at least one silicone chain is a polydimethyl siloxane chain.

8 . The silicone hydrogel of claim 5 wherein said at least one silicone chain is a polydiaryl siloxane chain.

9 . The ophthalmic device of any of the foregoing claims wherein said second reactive mixture comprises about 20 to about 60 wt % or about 30-about 50 wt % of said silicone containing component, based upon all reactive components.

10 . The ophthalmic device of any of the foregoing claims wherein said second reactive mixture comprises about 5 wt % to about 50 wt %, about 7 wt % to about 30 wt %, about 7 wt % to about 25 wt % or about 7 wt % to about 20 wt % of at least one N-alkyl methacrylamide, based upon all reactive components.

11 . The ophthalmic device of any of the foregoing claims wherein said silicone-containing component is selected from compounds of Formulae IIIa through IVc, and combinations thereof:

wherein R 1 is a hydrogen atom or methyl;
Z is selected from O, N, S or NR 1 CH 2 CH 2 O; when Z═O or S, R 2 is not required;
wherein j is a whole number between 1 and 20;
wherein R 19 is
a substituted or unsubstituted C 1-6 , C 1-4 or C 2-4 alkylene segment (CH 2 ) r
each methylene group may optionally be independently substituted with ethers, amines, carbonyls, carboxylates, carbamates and combinations thereof; or
an oxyalkylene segment (OCH 2 ) k and
k is a whole number from one to three, or wherein R 19 may be a mixture of alkylene and oxyalkylene segments and the sum of r and k is between 1 and 9;

wherein each R 3 and R 4 are independently a linear, branched, or cyclic alkyl group containing between one and six carbon atoms, a linear, branched, or cyclic alkoxy group containing between one and six carbon atoms, a linear or branched polyethyleneoxyalkyl group, a phenyl group, a benzyl group, a substituted or un-substituted aryl group, a fluoroalkyl group, a partially fluorinated alkyl group, a perfluoroalkyl group, a fluorine atom, or combinations thereof;
wherein R 5 is a substituted or un-substituted linear or branched alkyl group having 1 to eight carbon atoms, or 1 to 4 carbon atoms, or methyl or butyl; or an aryl group, any of which may be substituted with one or more fluorine atoms.

12 . The ophthalmic device of any of the foregoing claims wherein said at least one N-alkyl methacrylamide has the formula

wherein R′ is selected from linear, branched, or cyclic alkyl groups containing one to eight carbon atoms, benzyl or phenyl, any of which may be un-substituted or substituted with additional functional groups such as hydroxyl, amino, and combinations thereof.

13 . The ophthalmic device of claim 12 wherein said N-alkyl methacrylamide is N-methyl methacrylamide.

14 . The ophthalmic device of any of the foregoing claims wherein said second material has a modulus of about 1000 psi to about 200,000 psi, said second reactive mixture comprises about 5 to about 15 wt % at least one crosslinking component.

15 . The silicone hydrogel of claim 14 wherein said modulus is about 1000 to about 100,000 psi, or about 5000 to about 100,000 psi.

16 . The ophthalmic device of claim 14 wherein said second reactive mixture comprises about 20 to about 80 wt % or 30-80 wt % of said silicone containing component, based upon all reactive components.

17 . The ophthalmic device of claim 14 wherein said second reactive mixture comprises about 5 wt % to about 50 wt %, about 7 wt % to about 30 wt %, about 7 wt % to about 25 wt % or about 7 wt % to about 20 wt % of at least one N-alkyl methacrylamide, based upon all reactive components.

18 . The ophthalmic device of claim 14 wherein said second reactive mixture further comprises about 5 wt % to about 40 wt % or 20 to about 40 wt % of at least one hydroxyl functional silicone containing component.

19 . The ophthalmic device of claim 18 wherein said hydroxyl functional silicone containing component is a hydroxyl functional polysiloxane selected from the group consisting of polydialkyl siloxanes and polydiaryl siloxanes.

20 . The ophthalmic device of claim 19 wherein said second reactive mixture comprise about 10 to about 40 wt % hydroxyl functional polysiloxane.

21 . The ophthalmic device of claim 19 or 20 wherein said hydroxyl functional polysiloxane comprises at least one polydimethyl siloxane.

22 . The ophthalmic device of claim 19 or 20 wherein said hydroxyl functional silicone containing component is selected from the group consisting of monofunctional hydroxyl substituted poly(disubstituted siloxane)s of Formula XXI:

wherein Z is selected from O, N, S or NR 1 CH 2 CH 2 O, when Z is O or S R 2 is not present;
R 1 is independently H or methyl;
R 2 , R 3 and R 4 are independently a linear, branched, or cyclic alkyl group containing one to eight carbon atoms, any of which may be further substituted with at least one hydroxy group, and which may be optionally substituted with amide, ether, and combinations thereof; R 3 and R 4 may be independently selected from methyl, ethyl or phenyl, or may be methyl;
n is the number of siloxane units and is from 4 to 8 for the first monofunctional hydroxyl substituted poly(disubstituted siloxane) monomer, and
R 5 is selected from straight or branched C 1 to C 8 alkyl groups, which may be optionally substituted with one or more hydroxyl, amide, ether, and combinations thereof. R 5 may be straight or branched C 4 alkyl, either of which may optionally be substituted with hydroxyl, or may be methyl.

23 . The ophthalmic device of claim 19 or 20 wherein said hydroxyl functional silicone-containing component comprises mono-(2-hydroxy-3-methacryloxypropyl)-propyl ether terminated mono-n-butyl terminated polydimethylsiloxanes (OH-mPDMS) as shown in Formula XX

Assignees

• Johnson & Johnson Vision Care

Inventors

• Alli Azaam
• Sinha Dola

Classifications

• C08J2439/06

  Homopolymers or copolymers of N-vinyl-pyrrolidones · CPC title

• B29K2033/26

  Polymers of acrylamide or methacrylamide · CPC title

• G02C7/047

  Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae · CPC title

• B29K2105/0061

  Gel or sol · CPC title

• C08J3/28

  Treatment by wave energy or particle radiation · CPC title