Contact lenses for refractive correction
Ophthalmic lenses for correcting refractive error of an eye are disclosed. Ophthalmic lenses include a deformable inner portion and a deformable peripheral portion. When disposed over the optical region of an eye, the inner portion is configured so that engagement of the posterior surface against the eye deforms the posterior surface so that the posterior surface has a shape diverging form the refractive shape of the epithelium when viewing with the eye through the ophthalmic lens. The rigidity of the inner portion is greater than the rigidity of the peripheral portion and the ophthalmic lenses are configured to allow movement relative to the eye upon blinking of the eye and to be substantially centered on the optical region of the cornea following the blinking of the eye. Methods of correcting refractive errors of an eye such as astigmatism or spherical aberration using the ophthalmic lenses are also disclosed.
1. A method for selecting an ophthalmic lens for correcting a refractive error of an eye of a patient, the method comprising:
determining a desired spherical power of the ophthalmic lens so as to mitigate a spherical component of the refractive error;
identifying, from among a plurality of alternative ophthalmic lenses having differing spherical powers, the ophthalmic lens comprising:
an inner portion;
a peripheral portion, the peripheral portion having a shape suitable for engaging the eye outside an optical region of the eye so as to support the inner portion to be in alignment with the optical region; and
an anterior surface corresponding to the desired spherical power, the anterior surface extending along the inner portion,
wherein the inner portion is deformable and the peripheral portion is capable of elastic deformation.
2. The method of claim 1 , wherein a posterior surface of the ophthalmic lens is configured to extend across the optical region adjacent the eye;
wherein the identified ophthalmic lens has the peripheral portion has a suitable shape to form a lenticular volume between the posterior surface and a surface of a cornea to mitigate the refractive error comprising astigmatism or high-order aberration or a combination thereof.
3. The method of claim 1 , wherein the peripheral portion has a rigidity lower than that of the inner portion.
4. The method of claim 2 , wherein the identifying of the ophthalmic lens is independent of at least one member of the group:
a power of the astigmatism,
an orientation of the astigmatism about an optical axis of the eye,
a strength of the high-order aberrations and
a type of high-order aberration.
5. The method of claim 4 , wherein the identifying of the ophthalmic lens is independent of the orientation of the astigmatism about the optical axis of the eye.
6. The method of claim 1 , wherein an ophthalmic lens comprises a plurality of fenestrations that extend between the anterior surface and the posterior surface, the fenestrations disposed outside the optical region and inward of a region of engagement between the peripheral portion and a surface of the eye.
7. The method of claim 6 , wherein the peripheral portion is capable of elastic deformation to allow for blinking of the eye to induce flow of tear fluid through the fenestrations into and out of the lenticular volume.
8. The method of claim 1 , wherein the engagement between the peripheral portion and the surface of the eye along the engagement region inhibits lateral movement of the inner portion relative to the cornea during the blinking.
9. The method of claim 1 , wherein mitigation of the refractive error when viewing with the eye through the anterior surface is substantially independent of a shape of the lenticular volume throughout a range of astigmatic errors of at least about 1½D and is independent of a rotational orientation of the ophthalmic lens about a viewing axis of the eye.
10. A method for treating presbyopia of an eye of a patient, the eye having a cornea providing a refractive shape, the method comprising:
positioning an ophthalmic lens on the eye so that an inner portion of the ophthalmic lens is disposed over an optical region of the cornea,
wherein the inner portion of the ophthalmic lens is deformable and the peripheral portion has a rigidity lower than that of the inner portion, and
wherein a surface of the ophthalmic lens has a presbyopia-mitigating refractive shape;
supporting the inner portion of the ophthalmic lens by engagement between the peripheral portion of the ophthalmic lens and the eye outside the optical region.
11. The method of claim 10 , wherein the presbyopia-mitigating shape comprises an add region, a multifocal shape, and/or an aspherical shape.
12. A method for correcting a refractive error of an eye, the eye having a cornea with a surface providing a refractive shape extending across an optical region of the eye, the method comprising:
positioning an ophthalmic lens on the eye so that an inner portion of the ophthalmic lens is disposed over the optical region,
wherein a posterior surface of the positioned ophthalmic lens extends adjacent the optical region and has a shape diverging from the refractive shape of the surface of the cornea so that a lenticular volume is disposed therebetween;
supporting the inner portion of the ophthalmic lens by engagement between a peripheral portion of the ophthalmic lens and the eye outside the optical region so that fluid fills the lenticular volume and viewing with the eye through an anterior surface of the ophthalmic lens mitigates the refractive error.
13. The method of claim 12 , wherein the refractive error of the eye comprising astigmatism and/or spherical aberration.
14. The method of claim 12 , wherein the inner portion of the ophthalmic lens is deformable and the peripheral portion has a rigidity lower than that of the inner portion and the engagement between the peripheral portion and the tissue surface of the eye inhibits lateral movement of the inner portion from the optical region of the cornea.