Prismatic intraocular lenses and related method of using such lenses to restore vision in patients with central field loss
First Claim
1. A pair of intraocular lenses for restoring visual function to a patient with central field loss, the pair of intraocular lenses comprising:
- a first lens for implantation into a first eye of the patient to provide vision of targets located at a distance greater than five feet from the first eye; and
a second lens for implantation into a second eye of the patient to provide vision of targets at a distance less than twelve inches from the second eye,wherein the first and second lenses each include a prismatic wedge for shifting retinal images to a functional portion of a retina of each respective first and second eye.
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Accused Products
Abstract
A pair of intraocular lenses for restoring visual function to a patient with central field loss. The pair of intraocular lenses includes a first lens for implantation into a first eye of the patient to provide vision of targets located at a distance greater than five feet from the first eye and a second lens for implantation into a second eye of the patient to provide vision of targets at a distance less than twelve inches from the second eye. The first and second lenses each include a prismatic wedge for shifting retinal images to a functional portion of a retina of each respective first and second eye.
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Citations
31 Claims
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1. A pair of intraocular lenses for restoring visual function to a patient with central field loss, the pair of intraocular lenses comprising:
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a first lens for implantation into a first eye of the patient to provide vision of targets located at a distance greater than five feet from the first eye; and a second lens for implantation into a second eye of the patient to provide vision of targets at a distance less than twelve inches from the second eye, wherein the first and second lenses each include a prismatic wedge for shifting retinal images to a functional portion of a retina of each respective first and second eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A pair of intraocular lenses for restoring visual function to a patient with central field loss, the pair of intraocular lenses comprising:
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a first lens for implantation into a first eye of the patient to provide vision of targets located at a distance greater than five feet from the first eye; a second lens for implantation into a second eye of the patient to provide vision of targets at a distanceless than twelve inches from the second eye; and a plurality of haptics for securing each of said first and second lenses in the corresponding first and second eyes; wherein the first and second lenses each include a prismatic wedge for shifting retinal images to a functional portion of a retina of each respective first and second eye, and each of said plurality of haptics has a compressive restoring force in the range of approximately 150-250 mg of restoring force per millimeter of compression. - View Dependent Claims (10)
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11. A pair of intraocular lenses for restoring visual function to a patient with central field loss the pair of intraocular lenses comprising:
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a first lens for implantation into a first eye of the patient to provide vision of targets located at a distance greater than five feet from the first eye; and a second lens for implantation into a second eye of the patient to provide vision of targets at a distance less than twelve inches from the second eye, wherein the first and second lenses each include a prismatic wedge for shifting retinal images to a functional portion of a retina of each respective first and second eye, and a magnitude of an angle of the prismatic wedge for each of said first and second lenses is determined according to the following formula;
space="preserve" listing-type="equation">α
=360d/2Π
a (n.sub.1 -n.sub.2)where α
=the angle of the prismatic wedge;d=a distance from the functional portion of the retina to a fovea of each respective first and second eye; n1 =a refractive index of each prismatic wedge; n2 =a refractive index of an aqueous humor of each respective first and second eye; and a=a distance from a posterior plane of each intraocular lens to the fovea of the corresponding eye. - View Dependent Claims (12, 25)
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13. A pair of lenses for restoring visual function to a patient with central field loss, the pair of intraocular lenses comprising:
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a first convex intraocular lens positioned in a first eye of the patient for receiving and focusing a first set of light rays from a target located a distance greater than five feet from the first eye; a first prismatic wedge located posterior to the first convex intraocular lens for receiving the focused first set of light rays and redirecting the focused first set of light rays to a functional portion of a retina of the first eye; a second convex intraocular lens positioned in a second eye of the patient for receiving and focusing a second set of light rays from a target located a distance less than twelve inches from the second eye; and a second prismatic wedge located posterior to the second convex intraocular lens for receiving the focused second set of light rays and redirecting the focused second set of light rays to a functional portion of a retina of the second eye. - View Dependent Claims (14)
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15. A method of restoring visual function to a patient with central field loss comprising:
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passing a first set of light rays from a target located a distance greater than five feet from a first eye of the patient through a first convex intraocular lens optic positioned within the first eye to focus the light rays; passing the focused first set of light rays through a first prismatic wedge located posterior to the first convex intraocular lens optic to redirect the focused first set of light rays to a functional portion of a retina of the first eye; passing a second set of light rays from a target located a distance less than twelve inches from a second eye of the patient through a second convex intraocular lens optic positioned within the second eye to focus the light rays; and passing the focused second set of light rays through a second prismatic wedge located posterior to the second convex intraocular lens optic to redirect the focused first set of light rays to a functional portion of a retina of the second eye. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of restoring visual function to a patient with central field loss comprising:
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passing a first set of light rays from a target located a distance greater than five feet from a first eye of the patient through a first convex intraocular lens optic positioned within the first eve to focus the light rays; passing the focused first set of light rays through a first prismatic wedge located posterior to the first convex intretocular lens optic to redirect the for used first set of light rays to a functional portion of a retina of the first eye; passing a second set of light rays from a target located a distance less than twelve inches from a second eve of the patient through a second convex intraocular lens optic positioned within the second eye to focus the light rays; and passing the focused second set of light rays through a second prismatic wedge located posterior to the second convex intraocular lens optic to redirect the focused first set of light rays to a functional portion of a retina of the second eye, wherein a magnitude of an angle of the first and second prismatic wedges is determined according to the following formula;
space="preserve" listing-type="equation">α
=360d/2Π
a (n.sub.1 -n.sub.2)where α
=the angle of the prismatic wedge;d=a distance from the functional portion of the retina to a fovea of each respective first and second eye; n1 =a refractive index of each prismatic wedge; n2 =a refractive index of an aqueous humor of each respective first and second eye; and a=a distance from a posterior plane of each intraocular lens to the fovea of the corresponding eye.
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26. A lens for implantation into an eye comprising:
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a convex intraocular lens optic to focus a set of light rays; and a prismatic wedge located posterior to the lens optic to redirect the focused set of light rays to a functional portion of a retina of the eye, wherein a magnitude of an angle of the prismatic wedge is determined according to the following formula;
space="preserve" listing-type="equation">α
=360d/2Π
a (n.sub.1 -n.sub.2)where α
=the angle of the prismatic wedge;d=a distance from the functional portion of the retina to a fovea of the eye; n1 =a refractive index of the prismatic wedge; n2 =a refractive index of an aqueous humor of the eye; and a=a distance from a posterior plane of the lens optic to the fovea. - View Dependent Claims (27, 28, 29, 31)
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30. A lens for implantation into an eye comprising;
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a convex intraocular lens optic to focus a set of light rays; a prismatic wedge located posterior to the lens optic to redirect the focused set of light rays to a functional portion of a retina of the eye; and a plurality of haptics for securing the lens in the eye, wherein each of said plurality of haptics has a compressive restoring force in the range of approximately 150-250 mg of restoring force per millimeter of compression.
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Specification