Accommodating intraocular lens
An accommodating intraocular lens (IOL) device adapted for implantation in the lens capsule of a subject's eye. The IOL device includes an anterior refractive optical element and a membrane coupled to the refractive optical element. The anterior refractive optical element and the membrane define an enclosed cavity configured to contain a fluid. At least a portion of the membrane is configured to contact a posterior area of the lens capsule adjoining the vitreous body of the subject's eye. The fluid contained in the enclosed cavity exerts a deforming or displacing force on the anterior refractive optical element in response to an anterior force exerted on the membrane by the vitreous body. The IOL device may further include a haptic system to position the anterior refractive optical element and also to engage the zonules and ciliary muscles to provide additional means for accommodation.
1. An accommodating intraocular lens (IOL) device adapted for implantation in a lens capsule of a subject's eye, the IOL device comprising:
an anterior biconvex lens;
an elastic posterior portion;
an enclosed cavity defined between a posterior surface of the anterior biconvex lens and the elastic posterior portion;
a plate haptic coupled to a periphery of the elastic posterior portion and a periphery of the anterior biconvex lens, the haptic having a flat anterior surface and a flat posterior surface, a central plane of the plate haptic being aligned coplanar with a central plane of the anterior biconvex lens, the plate haptic comprising a hinge disposed between an outer end of the plate haptic and the periphery of the anterior biconvex lens that is configured to facilitate anterior and posterior axial movement of the anterior biconvex lens; and
an injection port disposed through a periphery of the accommodating IOL;
wherein the injection port is configured to be closed to contain a volume of fluid within the enclosed cavity to space apart the anterior biconvex lens and elastic posterior portion;
wherein the elastic posterior portion is configured to contact a posterior area of the lens capsule adjoining a vitreous body at least in an area at and surrounding an optical axis of the subject when the IOL device is implanted in the eye and the enclosed cavity contains the volume of fluid; and
wherein the posterior elastic portion actuates in response to an anterior force exerted by the vitreous body, causing the volume of fluid to exert a deforming and displacing force on the anterior biconvex lens.
2. The accommodating IOL device of claim 1 , wherein the anterior biconvex lens increases a degree of curvature in response to the anterior force exerted by the vitreous and decreases the degree of curvature in the absence of the anterior force.
3. The accommodating IOL device of claim 1 , the plate haptic comprising a narrowed portion between the outer end of the plate haptic and the periphery of the anterior biconvex lens.
4. The accommodating IOL device of claim 3 , wherein the plate haptic is configured to substantially center the anterior biconvex lens optical in a path of the optical axis of the subject when implanted in the subject's eye.
5. The accommodating IOL device of claim 4 , wherein the plate haptic is configured to bilaterally displace the anterior biconvex lens along the optical axis of the subject in response to a contraction and relaxation of a subject's ciliary muscles when the IOL device is implanted in the subject's eye.
6. The accommodating IOL device of claim 1 , wherein the injection port is configured to receive a plug to close the volume of fluid within the enclosed cavity.
7. An accommodating intraocular lens (IOL) device adapted for implantation in a lens capsule of a subject's eye, the IOL device comprising:
an anterior biconvex lens;
an elastic portion coupled to the anterior biconvex lens;
an enclosed cavity defined between the anterior biconvex lens and the elastic portion;
a haptic coupled to a periphery of the anterior biconvex lens, the haptic having a flat anterior surface and a flat posterior surface, a central plane of the haptic being aligned coplanar with a central plane of the anterior biconvex lens; and
an injection port disposed through a periphery of the accommodating IOL that is configured to close
to contain a volume of fluid within the enclosed cavity to space apart the anterior biconvex lens and the elastic portion;
wherein when the elastic portion actuates in response to ocular force, the volume of fluid and the anterior biconvex lens shift in response to such actuation.
8. The IOL device of claim 7 , wherein the injection port extends into the enclosed cavity and is self-sealing.
9. The IOL device of claim 7 , wherein the haptic comprises:
a first end directly coupled to the periphery of the anterior biconvex lens; and
a second end that is configured to be compressed by ocular forces of the subject;
wherein a hinge is disposed between the second end and the anterior biconvex lens such that the IOL device is configured to accommodate as ocular forces vary when ciliary muscles of the subject contract and relax.
10. The IOL device of claim 7 , wherein the elastic portion comprises a flexible membrane.
11. The IOL device of claim 7 , wherein the elastic portion comprises a central portion that is thicker than a peripheral thickness of the elastic portion, wherein central portion is configured to protect against the potentially degradative effects of laser treatment from YAG laser capsulotomy.
12. The IOL device of claim 7 , wherein the haptic is solid, not having an internal cavity configured to contain a volume of fluid between the flat anterior surface and the flat posterior surface.
13. The IOL device of claim 7 , wherein the haptic comprises a plate haptic.
14. The IOL device of claim 13 , further comprising a second haptic configured to couple the IOL device with a capsular bag of the subject's eye.
15. The accommodating IOL device of claim 7 , wherein the injection port is configured to receive a plug to close the volume of fluid within the enclosed cavity.