Heat tunable intraocular lens
A method and system provide an ophthalmic lens including a lens body having a chamber therein, a reservoir module coupled with the lens body and an optical fluid. At least part of the lens body is flexible. The reservoir module includes a reservoir and a heat sensitive portion bordering the reservoir. The reservoir has a reservoir volume and is fluidically connected with the chamber. The heat sensitive portion has a shape responsive to a temperature of at least forty five degrees Celsius such that the reservoir volume changes in response to at least part of the heat sensitive portion reaching the temperature. The optical fluid resides in the chamber and the reservoir. A change in the reservoir volume flows a portion of the optical fluid between the reservoir and the chamber such that the flexible portion of the lens body undergoes a shape change corresponding to a base power change.
1. An ophthalmic lens comprising:
a lens body having a chamber therein, at least a portion of the lens body being flexible, the lens body having a lens body index of refraction;
a reservoir coupled with the lens body and defining a reservoir volume that is fluidically connected with the chamber of the lens body, the reservoir comprising a plurality of heat sensitive structures that change shape from a first, substantially hemispherical shape to a second, substantially flattened shape responsive to a threshold temperature; and
an optical fluid residing in the chamber and the reservoir, the optical fluid having an optical fluid index of refraction, a change in the reservoir volume occur by flowing a portion of the optical fluid between the reservoir and the chamber such that the at least the portion of the lens body undergoes a shape change corresponding to a base power change,
wherein:
a first portion of the plurality of heat sensitive structures has a first orientation such that the change from the first, substantially hemispherical shape to the second, substantially flattened shape increases the reservoir volume; and
a second portion of the plurality of heat sensitive structures has a second orientation such that the change from the first, substantially hemispherical shape to the second, substantially flattened shape decreases the reservoir volume.
2. The ophthalmic lens of claim 1 wherein each of the plurality of heat sensitive structures has a volume.
3. The ophthalmic lens of claim 2 wherein the volume of each of the plurality of heat sensitive structures is the same.
4. The ophthalmic lens of claim 3 wherein the volume corresponds to a base power change of not more than 0.25 diopter.
5. The ophthalmic lens of claim 1 further comprising:
a microfluidics path for fluidically connecting the reservoir with the chamber.
6. The ophthalmic lens of claim 1 wherein the temperature is at least sixty degrees Celsius and not more than one hundred degrees Celsius.
7. The ophthalmic lens of claim 6 wherein the temperature is at least ninety degrees Celsius.
8. The ophthalmic lens of claim 1 wherein the lens body has a periphery, the reservoir being coupled with the lens body at the periphery.
9. The ophthalmic lens of claim 1 wherein the at least the portion of the lens body includes a flexible membrane and a second portion of the lens body being fixed.
10. The ophthalmic lens of claim 1 wherein at least a portion of each of the plurality of heat sensitive structures comprises a shape memory polymer having a glass transition not less than the temperature.
11. The ophthalmic lens of claim 10 wherein the shape memory polymer comprises an additive that absorbs light in a selected wavelength range.