Accommodating diffractive intraocular lens
A series of deformable, accommodating intraocular lenses is disclosed, where the series subtends a range of nominal powers. The capsular bag of the eye exerts a distorting force on the lens, thereby changing its power and allowing for accommodation. A full accommodation range is the lens power that brings a distant object into focus, subtracted from the lens power that brings a near object into focus. Each lens in the series has essentially the same shape, which is optimized to maximize the accommodation range for a given distorting force. Typically, the lenses in the series have a meniscus shape, although plano-convex and bi-convex may also be used. In order to vary the nominal power for each lens in the series, without significantly affecting the accommodation range, a diffraction grating is applied to one or both of the lens surfaces, where the grating power is different for each lens in the series.
1 . A method of providing a range of nominal powers for a plurality of intraocular lenses, the method comprising:
providing each lens in the plurality with essentially the same geometry; and
applying to each lens in the plurality a diffractive element having a diffractive power that is different for each lens in the plurality.
2 . The method of claim 1 , wherein each lens in the plurality is meniscus-shaped.
3 . The method of claim 1 , wherein each lens in the plurality is plano-convex.
4 . The method of claim 1 , wherein each lens in the plurality is bi-convex.
5 . The method of claim 1 , wherein the diffractive element is applied to a posterior face of each lens in the plurality.
6 . The method of claim 1 , wherein the diffractive element is applied to an anterior face of each lens in the plurality.
7 . The method of claim 1 , wherein the diffractive element comprises an anterior diffraction grating applied to the anterior face of each lens in the plurality and a posterior diffraction grating applied to the posterior face of each lens in the plurality.
8 . The method of claim 1 , wherein the each lens has a design wavelength, and wherein each diffractive element has a surface profile height generally equal to an integral number of design wavelengths.
9 . The method of claim 9 , wherein each diffractive element has a surface profile height generally equal to the design wavelength.
10 . The method of claim 1 , wherein each lens has a design wavelength of about 550 nm.
11 . A method of increasing a power of a deformable intraocular lens, comprising:
applying a diffraction grating to at least one of an anterior face or a posterior face of the deformable intraocular lens.
12 . A plurality of deformable, accommodating intraocular lenses, each lens comprising:
an anterior surface having an anterior radius;
a posterior surface having a posterior radius, disposed opposite the anterior surface and separated from the anterior surface by a thickness, wherein the anterior radii, posterior radii and thicknesses of all lenses in the plurality are essentially equal; and
a diffraction element having a diffractive power, disposed on at least one of the anterior or posterior surfaces, wherein the diffractive power is different for each lens in the plurality.
13 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the diffraction element comprises a diffraction grating applied to the anterior surface.
14 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the diffraction element comprises a diffraction grating applied to the posterior surface.
15 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the diffraction element comprises an anterior diffraction grating applied to the anterior surface and a posterior diffraction grating applied to the posterior surface.
16 . The plurality of deformable, accommodating intraocular lenses of claim 12 ,
wherein the anterior radius, the posterior radius, and the thickness define a refractive power;
wherein the refractive power is variable in response to a deforming force;
wherein the refractive power varies over a full accommodation range; and
wherein the full accommodation range is a power at the lens that brings a distant object into focus, subtracted from a power at the lens that brings a near object into focus.
17 . The plurality of deformable, accommodating intraocular lenses of claim 16 , wherein the full accommodation range is about 4 diopters.
18 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the anterior surface is convex.
19 . The plurality of deformable, accommodating intraocular lenses of claim 18 , wherein the anterior radius is about 5 mm.
20 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the posterior surface is concave.
21 . The plurality of deformable, accommodating intraocular lenses of claim 20 , wherein the posterior radius is between about 6 mm and about 7 mm.
22 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the posterior surface is flat.
23 . The plurality of deformable, accommodating intraocular lenses of claim 12 , wherein the posterior surface is convex.
24 . A plurality of deformable, accommodating intraocular lenses, each lens comprising:
an anterior surface having an anterior radius;
a posterior surface having a posterior radius, disposed opposite the anterior surface and separated from the anterior surface by a thickness;
a geometry defined by the anterior radius, the posterior radius and the thickness;
an accommodation range defined by the geometry, the accommodation ranges of all the lenses in the plurality being essentially equal; and
a diffraction grating having a diffractive power, disposed on one of the anterior or posterior surfaces, wherein the diffractive power is different for each lens in the plurality.
25 . The plurality of deformable, accommodating intraocular lenses of claim 24 , wherein the geometry defines a refractive power;
wherein the refractive power is variable in response to a deforming force;
wherein the refractive power varies over a full accommodation range; and
wherein the full accommodation range is a power at the lens that brings a distant object into focus, subtracted from a power at the lens that brings a near object into focus.
26 . An apparatus for providing a range of nominal powers for a plurality of intraocular lenses, the apparatus comprising:
means for providing each lens in the plurality with essentially the same geometry; and
means for applying to each lens in the plurality a diffractive element having a diffractive power that is different for each lens in the plurality.