Accommodating intraocular lens having peripherally actuated deflectable surface and method
An accommodating intraocular lens is provided in which a deflectable lens element is anchored to a substrate along its optical axis to define a fluid filled space. Fluid-filled haptics disposed in fluid communication with the space vary the fluid volume in the space responsive to forces applied by the ciliary muscles, thereby causing the periphery of the lens element to deflect relative to the substrate and changing the optical power of the intraocular lens.
1 . An intraocular lens comprising: a substrate comprising an optically transparent material;
a lens element having an optical axis, a periphery and an anchor disposed along the optical axis, the lens element comprising an optically transparent material, the lens element fixedly attached to the substrate to define a space between the lens element and the substrate; a haptic portion configured to deform responsive to forces applied by movement of the ciliary muscles, the haptic portion having an interior volume in fluid communication with the space; and a fluid disposed within the space and the interior volume of the haptic portion, wherein fluid transferred from the haptic portion to the space causes the periphery of the lens element to deform relative to the anchor to change an optical power of the intraocular lens.
2 . The intraocular lens of claim 1 wherein the lens element further comprises a sidewall configured to engage the substrate.
3 . The intraocular lens of claim 2 wherein the lens element further comprises a partition disposed adjacent to the sidewall, the partition configured to sealingly engage the substrate to define an annular chamber.
4 . The intraocular lens of claim 3 wherein the sidewall and partition deform responsive to the inflow of fluid from the haptic portion.
5 . The intraocular lens of claim 4 wherein the fluid has an index of refraction matched to indices of refraction of the lens element and substrate.
6 . The intraocular lens of claim 1 further comprising a posterior lens surface.
7 . The intraocular lens of claim 6 wherein posterior lens surface is integrally formed on a posterior face of the substrate.
8 . The intraocular lens of claim 1 wherein the intraocular lens has an accommodated state in which the lens element assumes a convex shape and an unaccommodated state in which the periphery of the lens element is displaced relative to the anchor to render the lens element less convex.
9 . The intraocular lens of claim 1 wherein the haptic portion comprises one or more deformable tubular members.
10 . The intraocular lens of claim 1 further comprising a flexible relief reservoir coupled in fluid communication with the space.
11 . The intraocular lens of claim 1 wherein the haptic portion comprises an anterior haptic half coupled to the lens element and a posterior haptic half coupled to the substrate.
12 . The intraocular lens of claim 11 wherein the anterior haptic half is coupled to the lens element by a flexible membrane.
13 . The intraocular lens of claim 11 further comprising a plurality of spacers that extend from the lens element.
14 . The intraocular lens of claim 13 wherein the substrate further comprises a peripheral step configured to engage the plurality of spacers.
15 . An intraocular lens comprising: a substrate having a centrally-disposed receptacle, the substrate comprising an optically transparent material; a lens element having a periphery and a centrally-disposed anchor, the lens element comprising an optically transparent material, the anchor fixedly coupled within the receptacle to define a space between the lens element and the substrate; a haptic portion configured to deform responsive to forces applied by movement of ciliary muscles, the haptic portion having an interior volume in fluid communication with the space; and a fluid disposed within the space and within the interior volume of the haptic portion, wherein fluid transferred from the haptic portion to the space causes the periphery of the lens element to deform relative to the anchor to change an optical power of the intraocular lens.
16 . The intraocular lens of claim 15 wherein the lens element further comprises: a sidewall configured to engage the substrate; and a partition disposed adjacent to the sidewall, the partition configured to engage the substrate to define an annular chamber.
17 . The intraocular lens of claim 16 wherein the sidewall and partition deform responsive to the inflow of fluid from the haptic portion.
18 . The intraocular lens of claim 15 wherein the fluid has an index of refraction matched to indices of refraction of the lens element and substrate.
19 . The intraocular lens of claim 15 further comprising a lens surface integrally formed on a surface of the substrate.
20 . The intraocular lens of claim 15 wherein the intraocular lens has an accommodated state in which the lens element assumes a convex shape and an unaccommodated state in which the periphery is displaced relative to the anchor to render the lens element less convex.