Electrowetting ophthalmic devices including an elastic electrode
Ophthalmic devices having elastic electrodes are disclosed herein. An example ophthalmic device may be an intraocular lens that includes a support structure, two optical windows, two immiscible fluids, and an elastic electrode. The support structure may have an inner surface defining an aperture with first and second optical windows disposed on opposite sides of the support structure and spanning the aperture. The two immiscible liquids may be disposed in a cavity formed by the aperture and the first and second optical windows, and the elastic electrode may be disposed on the inner surface. The elastic electrode may be formed from an elastic metal alloy having a minimum yield strain of 0.25%.
1. An intraocular lens (IOL) comprising:
a support structure comprising an elastic polymer, the support structure comprising a top side, a bottom side, and an inner surface, wherein the top side, the bottom side, and the inner surface form an aperture; and
a first optical window disposed on the top side, and a second optical window disposed on the bottom side;
and
an elastic electrode disposed on the inner surface to electrically induce electrowetting in the intraocular lens, wherein the elastic electrode is configured not to plastically deform after rolling or bending, and wherein the elastic electrode is configured to be folded or rolled without experiencing inelastic deformation upon unfolding or unrolling,
wherein the inner surface is at an oblique angle to the top and bottom sides of the support structure and defines a conical frustum shape.
2. The intraocular lens of claim 1 , wherein the elastic electrode is a sputtered elastic electrode.
3. The intraocular lens of claim 1 , wherein the elastic electrode has a thickness in a range of about 5 microns to about 100 microns.
4. The intraocular lens of claim 1 , wherein the elastic electrode is formed from an elastic metal alloy having a minimum yield strain of 0.25%.
5. The intraocular lens of claim 4 , wherein the elastic metal alloy is a shape-memory alloy.
6. The intraocular lens of claim 4 , wherein the elastic metal alloy is valve-metal coated.
7. The intraocular lens of claim 4 , wherein the elastic metal alloy is spring steel.
8. The intraocular lens of claim 4 , wherein the elastic metal alloy is Ti6A14V.
9. The intraocular lens of claim 1 , wherein the inner surface is truncated at an inner most diameter of the conical frustum shape.