Toric lens with decreased sensitivity to cylinder power and rotation and method of using the same
First Claim
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1. An intraocular lens, comprising:
- an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
a diffractive pattern imposed on at least one of the first shape and the second shape;
the first and second surfaces providing a base power and an add power;
wherein, when the optic is placed in an intraocular lens plane of a physical eye model including a model cornea, the modulation transfer function of the eye model exceeds about 0.17, at a spatial frequency of about 50 line pairs per millimeter, over a range of at least about 1.7 Diopters.
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Abstract
A method, system and apparatus for vision correction are disclosed. The method, system and apparatus include a toric intraocular element for correcting astigmatism and having a cylinder power, and a depth of focus extender coupled to the toric intraocular element, the depth of focus extender extending a depth of focus. The extended depth of focus may reduce sensitivity of the toric intraocular element to at least one of rotation and selected cylinder power.
260 Citations
6 Claims
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1. An intraocular lens, comprising:
- an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
a diffractive pattern imposed on at least one of the first shape and the second shape;
the first and second surfaces providing a base power and an add power;
wherein, when the optic is placed in an intraocular lens plane of a physical eye model including a model cornea, the modulation transfer function of the eye model exceeds about 0.17, at a spatial frequency of about 50 line pairs per millimeter, over a range of at least about 1.7 Diopters.
- an optic comprising a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
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2. An intraocular lens, comprising:
- a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
a diffractive pattern imposed on the first shape or the second shape;
the first and second surfaces providing a base power and an add power;
the intraocular lens having a depth of focus, when illuminated by a light source, that is at least about 30% greater than that of an intraocular reference lens without the diffractive pattern, the intraocular reference lens having a refractive power that is equal to the base power of the intraocular lens. - View Dependent Claims (3, 4, 5, 6)
- a first surface having a first shape and an opposing second surface having a second shape, the first and second shapes providing a refractive power;
Specification