Bimodular contact lenses
Ophthalmic lenses for correcting refractive error of an eye are disclosed. Ophthalmic lenses include an inner optic portion configured to be disposed over the optical region of the cornea and having a central portion disposed between an anterior portion and a posterior portion. The inner optic portions configured to at least partially diverge from the shape of the cornea to provide at least one lenticular volume between a posterior surface of the inner optic portion and the cornea. The central portion may be characterized by a thickness from 50 μm to 900 μm and a modulus form 20 MPa to 1500 MPa.
1. An ophthalmic lens for correcting a refractive error of an eye, the eye comprising a cornea with a refractive shape extending across an optical region of the cornea, the ophthalmic lens comprising:
an inner optic portion configured to be disposed over the optical region of the cornea, wherein the inner optic portion comprises an anterior surface, a first portion, and a posterior portion disposed posteriorly to the first portion;
a posterior surface extending along the inner optic portion adjacent the eye and configured so that engagement of the posterior surface against the cornea deforms the posterior surface and so that the posterior surface has a shape diverging from the refractive shape of the cornea and providing one or more lenticular volumes between the posterior surface and the cornea;
a peripheral portion of the ophthalmic lens disposed radially outward of the inner optic portion; and
a plurality of fenestrations disposed within the inner optic portion, the peripheral portion, or both the inner optic portion and the peripheral portion; wherein at least some of the plurality of fenestrations are configured to maintain tear fluid within the one or more lenticular volumes between the posterior surface of the inner optic portion and the cornea;
wherein the first portion comprises a material characterized by a first modulus from about 20 MPa to about 1500 MPa.
2. The ophthalmic lens of claim 1 , wherein the anterior surface is characterized by a spherical profile.
3. The ophthalmic lens of claim 1 , wherein the first portion is characterized by a maximum thickness from about 50 μm to about 900 μm.
4. The ophthalmic lens of claim 1 , wherein,
the posterior portion comprises a posterior material characterized by a posterior modulus; and
the posterior modulus is less than the first modulus.
5. The ophthalmic lens of claim 4 , wherein the posterior modulus is from about 0.1 MPa to about 10 MPa.
6. The ophthalmic lens of claim 4 , wherein the posterior portion is characterized by a thickness from about 5 μm to about 100 μm.
7. The ophthalmic lens of claim 4 , wherein the posterior material comprises a hydrogel.
8. The ophthalmic lens of claim 1 , wherein the first portion comprises a hydrogel.
9. The ophthalmic lens of claim 1 , wherein the first portion and the posterior portion comprise silicon.
10. The ophthalmic lens of claim 1 , wherein the inner optic portion is characterized by a shape configured to provide spherical power from +10.00 D to −10.00 D.
11. The ophthalmic lens of claim 1 , wherein the inner optic portion is characterized by a rigidity from 4E8 MPa-μm 3 to 1E10 MPa-μm 3 .
12. The ophthalmic lens of claim 1 , wherein the posterior surface is characterized by a bicurve profile.
13. The ophthalmic lens of claim 12 , wherein the bicurve profile comprises a toric component.
14. The ophthalmic lens of claim 1 , wherein,
the cornea is characterized by an optical axis; and
the ophthalmic lens is configured to correct refractive error independent of radial orientation with respect to the optical axis.
15. The ophthalmic lens of claim 1 , wherein:
the refractive error of the eye comprises a cylindrical error; and
the inner optic portion is characterized by a substantially spherical surface so that correction of the cylindrical error by the lens is primarily effected by the divergence of the shape of the inner optic portion from the refractive shape of the cornea.
16. The ophthalmic lens of claim 1 , wherein at least some of the plurality of fenestrations are disposed proximate an interface between the inner optic portion and the peripheral portion.
17. The ophthalmic lens of claim 1 , wherein at least some of the plurality of fenestrations are configured to maintain tear fluid within the one or more lenticular volumes between the posterior surface of the inner optic portion and the cornea.
18. The ophthalmic lens of claim 1 , wherein at least some of the plurality of fenestrations are configured to pump tear fluid between the posterior surface of the lens and the one or more lenticular volumes between the posterior surface and the cornea when the eye blinks.
19. The ophthalmic lens of claim 1 , wherein,
the refractive error of the eye comprises astigmatism; and
the anterior surface of the inner optic portion and the posterior surface of the inner optic portion are radially symmetric.
20. A method for correcting a refractive error of an eye, the eye having a cornea with a refractive shape extending across an optical region of the cornea, the method comprising positioning the ophthalmic lens of claim 1 on an eye comprising a refractive error, to correct the refractive error.
21. The method of claim 20 , wherein correction of the refractive error is substantially independent of the shape of the peripheral portion throughout a range of astigmatic errors of at least about 1.5 D, and is independent of a rotational orientation of the ophthalmic lens about a viewing axis of the eye.