Treating ocular refractive error
A lens for an eye that includes a zone with a first power profile for images received by the retina on the fovea, a zone with a second power profile for images received by the peripheral retina on the nasal side and a zone with a third power profile for images received by the peripheral retina on the temporal side. The first power profile is selected to provide clear or acceptable vision and the second and third power profiles are selected to affect the peripheral image position.
1 . A lens for affecting the progression of myopia in an eye, the lens comprising:
a nasal optic zone and a temporal optic zone for refracting light to be received by the peripheral retina so as to be focused on or in front of the retina, wherein the nasal optic zone and the temporal optic zone have different refractive powers;
a central optic zone between the nasal and the temporal optic zones, the central optic zone being asymmetrical about a vertical meridian through the lens, so as to extend across horizontal half meridians of the lens to different extents, wherein the vertical and horizontal meridians refer to the orientation of the lens caused by a stabilizing mechanism.
2 . The lens of claim 1 further comprising a central optic zone with a refractive power to correct on-axis vision of the eye.
3 . The lens of claim 1 wherein the nasal optic zone has an increased power relative to a power on-axis and the temporal optic zone has a decreased power relative to the power on-axis.
4 . The lens of claim 1 wherein the temporal optic zone has an increased power relative to an on-axis power and the nasal optic zone has a decreased power relative to the on-axis power.
5 . The lens of claim 1 , wherein the central optic zone is not plano and includes a refractive power for correcting defocus.
6 . The lens of claim 1 , wherein the nasal optic zone and the temporal optic zone both include a substantially constant refractive power in a vertical direction, wherein the vertical direction is with reference to the orientation of the lens caused by the stabilizing mechanism.
7 . The lens of claim 1 , wherein the nasal and temporal optic zones have a vertical height of between 0.5 mm and 3 mm.
8 . The lens of claim 7 , further comprising a central optic zone with a refractive power to correct on-axis vision of the eye, wherein the lens has a refractive power substantially equal to the refractive power of the central optic zone above and below the nasal and temporal optic zones.
9 . The lens of claim 1 , further comprising a central optic zone with a refractive power to correct on-axis vision of the eye, wherein the central optic zone is substantially rotationally symmetrical.
10 . The lens of claim 1 , further comprising a central optic zone with a refractive power to correct on-axis vision of the eye, wherein the central optic zone is elongate in a vertical direction across the lens, wherein the vertical direction is with reference to the orientation of the lens caused by a stabilizing mechanism.
11 . The lens of claim 10 , wherein the lens is a contact lens with an optic zone and a carrier and wherein the central optic zone extends in the vertical direction across substantially the entire optic zone.
12 . The lens of claim 1 , wherein one of the nasal optic zone and temporal optic zone has a power selected to place peripheral images on the retina and the other zone has a power selected to place peripheral images off the retina.