Lens having an optically controlled peripheral portion and a method for designing and manufacturing the lens
View Patent ↗A contact lens or phakic IOC lens is provided with a peripheral portion that has a power profile that provides optical control of peripheral vision images. Typically, the central portion of the lens is also provided with optical control. The power profile of the lens at the boundary of the central and peripheral portions meets certain boundary conditions that ensure that the lens provides a desired or selected vision correction. Because the peripheral portion of the lens provides optical control that defocuses the peripheral vision image relative to the retina, the lens can be used to prevent or inhibit growth of the eye, thereby preventing or inhibiting myopia or the effects of myopia.
1. A lens for controlling a location at which a peripheral vision image is focused relative to a retina of an eye, the lens comprising:
a central portion having at least one optical zone that provides optical control over light rays passing through the central portion, the central portion having a power profile that optically controls a location at which a center vision image is focused relative to a retina of an eye, wherein the central portion extends a radial distance from a center of the lens outwardly toward a periphery of the central portion that is between about 3.5 millimeters (mm) and about 4.0 mm,
a peripheral portion having at least one optical zone that provides optical control over light rays passing through the peripheral portion, the peripheral portion having a power profile that optically controls a location at which a peripheral vision image is focused relative to a retina of an eye, wherein the power profile of the peripheral portion is defined by a mathematical function that is discontinuous at the boundary where the periphery of the central portion meets the peripheral portion such that a first derivative of the function is not obtainable, and wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 8.0 Diopters; and
wherein the lens, when worn on a person's eye, provides myopic defocus of the peripheral vision image that helps prevent or inhibit growth of the eye.
2. The lens of claim 1 , wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 3.0 Diopters.
3. The lens of claim 1 , wherein the mathematical function is a piecewise function.
4. The lens of claim 1 , wherein the lens is a soft contact lens.
5. The lens of claim 1 , wherein the lens is a hard contact lens.
6. The lens of claim 1 , wherein the lens is a phakic intraocular (IOC) lens.
7. A lens for controlling a location at which a peripheral vision image is focused relative to a retina of an eye, the lens comprising:
a central portion having at least one optical zone that provides optical control over light rays passing through the central portion, the central portion having a power profile that optically controls a location at which a center vision image is focused relative to a retina of an eye, wherein the central portion extends a radial distance from a center of the lens outwardly toward a periphery of the central portion that is between about 3.5 millimeters (mm) and about 4.0 mm
a peripheral portion having at least one optical zone that provides optical control over light rays passing through the peripheral portion, the peripheral portion having a power profile that optically controls a location at which a peripheral vision image is focused relative to a retina of an eye, wherein the power profile of the peripheral portion is defined by a mathematical function that is continuous at the boundary where the periphery of the central portion meets the peripheral portion and that is not differentiable in a first derivative at the boundary, and wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 8.0 Diopters, and
wherein the lens, when worn on a person's eye, provides myopic defocus of the peripheral vision image that helps prevent or inhibit growth of the eye.
8. The lens of claim 7 , wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 3.0 Diopters.
9. The lens of claim 7 , wherein the mathematical function is a spline.
10. The lens of claim 7 , wherein the lens is a soft contact lens.
11. The lens of claim 7 , wherein the lens is a hard contact lens.
12. The lens of claim 7 , wherein the lens is a phakic intraocular (IOC) lens.
13. A method for providing a lens to be worn on a person's eye that prevents or inhibits myopia by preventing or inhibiting eye growth, the method comprising:
selecting a power profile for a peripheral portion of a lens to be designed, the power profile of the peripheral portion optically controlling a location at which a peripheral vision image is focused relative to a retina of an eye, the lens having a central portion, the central portion having a power profile that optically controls a location at which a center vision image is focused relative to a retina of an eye, wherein the central portion extends a radial distance from a center of the lens outwardly toward a periphery of the central portion that is between about 3.5 millimeters (mm) and about 4.0 mm, and wherein the peripheral portion extends a radial distance from a boundary where the periphery of the central portion meets the peripheral portion to a periphery of the peripheral portion of about 3.5 mm to about 4.0 mm; and
producing a design of a lens having the central portion and the peripheral portion, the peripheral portion having the selected power profile, wherein the power profile of the peripheral portion is defined by a mathematical function that is discontinuous at the boundary where the periphery of the central portion meets the peripheral portion such that a first derivative of the function is not obtainable, and wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 8.0 Diopters; and
wherein the lens, when worn on a person's eye, provides myopic defocus of the peripheral vision image that helps prevent or inhibit growth of the eye.
14. The method of claim 13 , further comprising:
manufacturing a lens or a plurality of lenses having the lens design.
15. The method of claim 13 , wherein the optical power provided by the power profile of the central portion at the boundary and the optical power provided by the power profile of the peripheral portion at the boundary differ by no more than about 3.0 Diopters.