Toric intraocular lens with modified power characteristics
First Claim
1. A toric ophthalmic lens comprising an optic, the optic comprised of an anterior surface and a posterior surface with toric features on either the posterior or anterior surface, the toric features comprised of meridians, including a high power meridian and a low power meridian orthogonal to the high power meridian, with at least one radially modulated meridian along which power monotonically varies in a stepwise manner with increasing radial position.
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Accused Products
Abstract
An intraocular lens for correcting or reducing the astigmatism of a cornea includes an optical element that has optical properties and characteristics that make it tolerant of rotational misalignment, when compared to a comparable lens having a uniform astigmatism orientation across its entire optical element, leading to more relaxed tolerances for a surgeon that implants the lens. The optical element of the toric ophthalmic lens has meridians associated therewith, including a high power meridian and a low power meridian orthogonal to the high power meridian. The optical element has at least one radially modulated meridian along which power monotonically varies with increasing radial position.
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Citations
20 Claims
- 1. A toric ophthalmic lens comprising an optic, the optic comprised of an anterior surface and a posterior surface with toric features on either the posterior or anterior surface, the toric features comprised of meridians, including a high power meridian and a low power meridian orthogonal to the high power meridian, with at least one radially modulated meridian along which power monotonically varies in a stepwise manner with increasing radial position.
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8. A toric ophthalmic lens comprising an optic, the optic comprised of an anterior surface and a posterior surface with toric features on either the posterior or anterior surface, the toric features having meridians associated therewith, including a high power meridian and a low power meridian orthogonal to the high power meridian, wherein along the high power meridian:
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between an originating position and a respective first radial position, power equals a respective nominal power; between the respective first radial position and a respective second radial position, power is greater than the respective nominal power; and between the respective second radial position and a respective third radial position, power is less than the respective nominal power; wherein the power between the originating position and the respective third radial position monotonically varies in a stepwise manner. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of manufacturing a toric ophthalmic lens having meridians associated therewith, including a reference meridian, a high power meridian, and a low power meridian orthogonal to the high power meridian, the method comprising:
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providing a standard toric lens function that defines power such that each meridian corresponds to a respective constant power; applying a modification function to the standard toric lens function to obtain a modified toric lens function, wherein the modification function is a function of radial position and angle position relative to the reference meridian, and wherein the modified toric lens function results in non-constant power along at least one meridian;
wherein the non-constant power monotonically varies in a stepwise manner with increasing radial position; andfabricating the toric ophthalmic lens in accordance with the modified toric lens function. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification