Systems, Methods and Devices for Controlling the Progression of Myopia
An ophthalmic lens system for reducing the risk of progression of a myopic eye by selectively maintaining, inducing or creating asymmetry of the peripheral retinal profile for the eye. A method for reducing the risk of progression of myopia comprising determining the magnitude of asymmetry of the on-axis/off-axis refractive error profile or eye length profile of the eye and providing an ophthalmic lens system that corrects for and provides acceptable on-axis vision and simultaneously controls the position of the off-axis refractive error profile or eye length profile such that resultant profile of the eye is asymmetric.
1 . An ophthalmic system for a myopic eye, the system comprising:
a central optical zone with a first focal length;
a temporal optical zone with a second focal length different to the first focal length and configured to focus images at the nasal peripheral retina of the eye, and a nasal optical zone with a third focal length different from the first focal length and configured to focus images at the temporal peripheral retina of the eye,
wherein the first focal length is selected to provide acceptable vision for distance and the second and third focal lengths are selected such that the second focal length is shorter than the first and third focal lengths so as to induce asymmetry.
2 . The ophthalmic system of claim 1 , wherein the second focal length and third focal length are substantially variable across their respective optical zones.
3 . The ophthalmic system of claim 1 , wherein the ophthalmic system is a contact lens or a spectacle lens.
4 . The ophthalmic system of claim 1 , wherein the first, second and third focal lengths are determined by the lens power profile.
5 . The ophthalmic system of claim 1 4, wherein the lens power profile is such that the second focal power profile is relatively more positive than the first and third surface power profiles.
6 . The ophthalmic system of claim 1 , wherein the second focal power profile is relatively more positive than the first and/or third surface power profiles by about 0.75 D.
7 . The ophthalmic system of claim 1 , wherein the ophthalmic system is an orthokeratology lens or a corneal implant or refractive surgery.
8 . The ophthalmic system of claim 1 , wherein the first, second and third focal lengths are determined by the effect of the ophthalmic system on the corneal curvature or corneal power or both.
9 . The ophthalmic system of claim 1 , wherein the central optical zone, temporal optical zone and the nasal optical zone are substantially unequal in surface area.
10 . The ophthalmic system of claim 1 , wherein the ophthalmic system is selected from one or more of a retinal implant, a scleral implant, a scleral buckle or a retinal prosthesis.
11 - 16 . (canceled)
17 . An ophthalmic lens for a myopic eye, the lens comprising:
a horizontal axis that includes a center point of the lens and extends across the lens from the most nasal side of the lens to the most temporal side of the lens when the lens is in an as worn position,
a central optical zone with a first power profile for correcting the refractive error at the fovea of the eye, the central optical zone comprising the center point of the lens, a temporal optical zone with a second power profile, different than the first power profile, to focus images substantially close to or on the nasal peripheral retina, the temporal optical zone located temporally when in a worn position and comprising a region along the horizontal axis, and
a nasal optical zone with a third power profile, different from the first power profile, to focus images substantially close to or on the temporal peripheral retina, the nasal optical zone located nasally when in a worn position and comprising a region along the horizontal axis,
wherein the second and third power profiles are selected such that the second power profile is relatively more positive than the first and third power profile so as to induce asymmetry.
18 . The lens of claim 17 , wherein the ophthalmic lens is a spectacle lens.
19 . The lens of claim 17 , wherein the ophthalmic lens comprises an orthokeratology lens and wherein the first to third power profiles are effected as a reshaping of the cornea of the eye.
20 . The lens of claim 17 , wherein the ophthalmic lens is a contact lens and further comprises a lens stabilizing mechanism for orienting the lens on the eye.
21 . An ophthalmic lens for affecting a progression of myopia in an eye, the lens comprising:
a central optical zone with an on-axis power to correct on-axis vision of the eye;
a nasal optical zone and a temporal optical zone, wherein the nasal optical zone and the temporal optical one have different refractive power profiles and refract light to be focused on or in front o the peripheral retina; and
wherein the nasal optical zone and the temporal optic zone have a power relative to the on-axis power selected such that the nasal retina experiences relatively more myopic defocus than the temporal retina.
22 . The lens of claim 21 , wherein the lens is one of a contact lens or a spectacle lens.
23 - 25 . (canceled)
26 . The lens of claim 21 , wherein the nalas optic zone has a vertical height of between 0.5 mm and 3 mm and the temporal optic zone has a vertical height of between 0.5 mm and 3 mm.
27 . The lens of claim 21 , wherein the central optic zone is substantially rotationally symmetrical.
28 . The lens of claim 21 , wherein the central optic zone is elongated in a vertical direction across the lens, wherein the vertical direction is with reference to an orientation of the lens cause by the stabilizing mechanism.
29 - 39 . (canceled)