INTRAOCULAR LENS HAVING EXTENDED DEPTH OF FOCUS
First Claim
1. 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 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 the add power is less than or equal to about two Diopters.
3 Assignments
0 Petitions
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.
223 Citations
23 Claims
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1. An intraocular lens, comprising:
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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 the add power is less than or equal to about two Diopters. - 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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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; the intraocular lens being optically described by a model lens, such that when the model lens is included in an intraocular lens plane of an 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. - View Dependent Claims (12, 13, 14)
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15. 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; 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. - View Dependent Claims (16)
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17. An intraocular lens, comprising:
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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 (18, 19, 20, 21, 22, 23)
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Specification