Toric optic for ophthalmic use
First Claim
1. A method of producing an ophthalmic element, comprising:
- providing a model cornea, the model cornea characterized by one or more of;
an aspheric profile along a first meridian of the model cornea that is different from an aspheric profile along an orthogonal second meridian of the model cornea;
one or more of fifth-order, seventh-order, and ninth-order aberrations; and
an asphericity of a first zone of the model cornea that is different from an asphericity of a second zone of the model cornea surrounding the first zone;
providing a model ophthalmic element disposed about an optical axis having a primary meridian and an orthogonal secondary meridian, the model ophthalmic element comprising an anterior surface and an opposing posterior surface, the model ophthalmic element characterized by a higher order toric shape imposed on one of the surfaces, the higher order toric shape including a first profile disposed along the primary meridian and a second profile disposed along the secondary meridian that is different in shape from the first profile, the higher order toric shape being characterized by a profile along at least one meridian that changes with increasing radius from the optical axis raised to a power that is greater than two;
providing a merit function representative of the optical performance of a system including the model cornea and the model ophthalmic element;
selecting a value of a first coefficient of an equation characterizing the higher order toric shape of the model ophthalmic element;
calculating a value of the merit function based on the value of the first coefficient and determining whether the value of the merit function is above a predetermined value;
repeating selecting a value of the first coefficient and calculating a value of the merit function until the merit function is above the threshold value; and
producing a physical ophthalmic element based on a value of the first coefficient that causes the merit function to be above the threshold value.
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Accused Products
Abstract
An ophthalmic lens for modifying or reducing non-axisymmetric higher order aberrations includes an optic body disposed about an optical axis having a primary meridian and an orthogonal secondary meridian. The optic body includes a higher order toric shape that is imposed on or added to one of the optic body surfaces. The higher order toric shape also includes a first profile disposed along the primary meridian and a second profile disposed along the secondary meridian that is different in shape from the first profile. The higher order toric shape is characterized by a profile along at least one meridian of the lens that changes with increasing radius from the optical axis raised to a power that is greater than two.
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Citations
11 Claims
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1. A method of producing an ophthalmic element, comprising:
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providing a model cornea, the model cornea characterized by one or more of; an aspheric profile along a first meridian of the model cornea that is different from an aspheric profile along an orthogonal second meridian of the model cornea; one or more of fifth-order, seventh-order, and ninth-order aberrations; and an asphericity of a first zone of the model cornea that is different from an asphericity of a second zone of the model cornea surrounding the first zone; providing a model ophthalmic element disposed about an optical axis having a primary meridian and an orthogonal secondary meridian, the model ophthalmic element comprising an anterior surface and an opposing posterior surface, the model ophthalmic element characterized by a higher order toric shape imposed on one of the surfaces, the higher order toric shape including a first profile disposed along the primary meridian and a second profile disposed along the secondary meridian that is different in shape from the first profile, the higher order toric shape being characterized by a profile along at least one meridian that changes with increasing radius from the optical axis raised to a power that is greater than two; providing a merit function representative of the optical performance of a system including the model cornea and the model ophthalmic element; selecting a value of a first coefficient of an equation characterizing the higher order toric shape of the model ophthalmic element; calculating a value of the merit function based on the value of the first coefficient and determining whether the value of the merit function is above a predetermined value; repeating selecting a value of the first coefficient and calculating a value of the merit function until the merit function is above the threshold value; and producing a physical ophthalmic element based on a value of the first coefficient that causes the merit function to be above the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for producing an ophthalmic element, comprising:
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a memory coupled to a processor, the memory comprising a plurality of code modules for execution by the processor and one or more data values used during execution of the code modules, the memory including; i) data for defining a model cornea characterized by one or more of; an aspheric profile along a first meridian of the model cornea that is different from an aspheric profile along a second meridian of the model cornea; one or more of fifth-order, seventh-order, and ninth-order aberrations; and an asphericity of a first zone of the model cornea that is different from an asphericity of a second zone of the model cornea surrounding the first zone; ii) data for defining a model ophthalmic element disposed about an optical axis comprising an anterior surface and an opposing posterior surface, the model ophthalmic element characterized by a higher order toric shape imposed on one of the surfaces, the higher order toric shape including a first profile disposed along a primary meridian of the model ophthalmic element and a second profile disposed along a secondary meridian of the model ophthalmic element that is different in shape from the first profile, the higher order toric shape being characterized by a profile along at least one meridian that changes with increasing radius from the optical axis raised to a power that is greater than two; iii) one or more code modules for calculating a merit function representative of the optical performance of a system including the model cornea and the model ophthalmic element; iv) one or more code modules for selecting a value of a first coefficient of an equation characterizing the higher order toric shape of the model ophthalmic element; v) one or more code modules for calculating a value of the merit function based on the value of the first coefficient and determining whether the value of the merit function is above a predetermined value; vi) one or more code modules for repeating selecting a value of the first coefficient and calculating a value of the merit function until the merit function is above the threshold value; and vii) one or more code modules for providing parameters necessary to produce a physical ophthalmic element, the parameter values being based on a value of the first coefficient that causes the merit function to be above the threshold value; and an output containing the parameters necessary to produce the physical ophthalmic element. - View Dependent Claims (11)
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Specification