Intraocular lens having extended depth of focus
First Claim
1. An intraocular lens, comprising:
- an optic including 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 with a concentric central zone having a center and a plurality of concentric zones surrounding the central zone wherein the central zone and the plurality of concentric zones are each comprised of an edge with a step discontinuity at the edge having a step height between about 1 micron and 3.3 microns, wherein the central zone is configured such that the edge of the central zone is 360°
out of phase with the center of the central zone; and
whereinthe first and second surfaces provide a base power and an add power that is between 0.5 Diopter and 1.5 Diopter so that the intraocular lens has a depth of focus that exceeds that of any single focus of a similar spherical lens having an optical power equal to the base power of the intraocular lens.
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Accused Products
Abstract
An intraocular lens is disclosed, which includes a diffractive element with a relatively low add power. The add power may be less than about 2 Diopters, may be less than about 1 Diopter, or may be in the ranges of 0.5 to 2.5 Diopters, or 1.0 to 2.0 Diopters, or 1.5 to 2.0 Diopters, or 1.0 to 1.5 Diopters. The low-add-power diffractive element increases the depth of the focus of the intraocular lens, for example, compared to a similarly shaped intraocular lens without the diffractive element. In one embodiment, the depth of focus is defined in terms of a threshold MTF value at a particular spatial frequency. The threshold may be an absolute threshold, such as 0.10, 0.15, 0.17, 0.20, 0.25 or 0.30, or may be a relative threshold, such as a particular percentage of the peak value. The spatial frequency may be 25 line pairs per mm, 50 line pairs per mm, 100 line pairs per mm, or any suitable value.
155 Citations
22 Claims
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1. An intraocular lens, comprising:
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an optic including 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 with a concentric central zone having a center and a plurality of concentric zones surrounding the central zone wherein the central zone and the plurality of concentric zones are each comprised of an edge with a step discontinuity at the edge having a step height between about 1 micron and 3.3 microns, wherein the central zone is configured such that the edge of the central zone is 360°
out of phase with the center of the central zone; and
whereinthe first and second surfaces provide a base power and an add power that is between 0.5 Diopter and 1.5 Diopter so that the intraocular lens has a depth of focus that exceeds that of any single focus of a similar spherical lens having an optical power equal to the base power of the intraocular lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An intraocular lens, comprising:
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an optic including 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 with a concentric central zone having a center and a plurality of concentric zones surrounding the central zone wherein the central zone and the plurality of concentric zones are each comprised of an edge with a step discontinuity at the having a step height between about 1 micron and 3.0 microns, wherein the central zone is configured such that the edge of the central zone is 360°
out of phase with the center of the central zone; and
wherein the first and second surfaces provide a base power and an add power that is between 0.5 Diopter and 1.5 Diopter such that when the intraocular lens is optically described by a model lens, and the model lens is included in an intraocular lens plane of an eye model including a model cornea, a design wavelength of 550 nm, and a pupil radius of 1.5 mm, the eye model has an extended depth of focus characterized by a modulation transfer function that exceeds 0.17, at a spatial frequency of 50 line pairs per millimeter, over a range of at least about 1.7 Diopters. - View Dependent Claims (12, 13)
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14. An intraocular lens, comprising:
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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 with a concentric central zone having a center and a plurality of concentric zones surrounding the central zone wherein the central zone and the plurality of concentric zones are each comprised of an edge with a step discontinuity at the edge having a step height between about 1 micron and 3.0 microns, wherein the central zone is configured such that the edge of the central zone is 360°
out of phase with the center of the central zone; and
wherein the first and second surfaces provide a base power and an add power that is between 0.5 Diopter and 1.5 Diopter such that when the optic is placed in an intraocular lens plane of a physical eye model including a model cornea, a design wavelength of 550 nm, and a pupil radius of 1.5 mm, the eye model has an extended depth of focus characterized by a modulation transfer function that exceeds 0.17, at a spatial frequency of 50 line pairs per millimeter, over a range of at least about 1.7 Diopters. - View Dependent Claims (15)
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16. An intraocular lens, comprising:
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an optic including 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 with a concentric central zone having a center and a plurality of concentric zones surrounding the central zone wherein the central zone and the plurality of concentric zones are each comprised of an edge with a step discontinuity at the edge having a step height between about 1 micron and 3.0 microns, wherein the central zone is configured such that the edge of the central zone is 360°
out of phase with the center of the central zone such that the intraocular lens has an extended depth of focus characterized by a depth of focus that is at least about 30% greater than that of a reference lens without a diffractive pattern, the reference lens having a refractive power that is equal to the base power of the intraocular lens.- View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification