Interfacial refraction accommodating lens (IRAL)
This invention relates to intraocular lenses. More particularly, this invention relates to intraocular lenses that have the ability to alter the light refractive power in response to changes in the tension of the ciliary muscle or ciliary body of the eye or any other accommodative forces. Lenses of this invention are generally referred to as interfacial, i.e., lens properties being defined as the interface of two liquids having different refractive indices, refractive accommodating lenses (IRAL).
1. A method of correcting visual acuity, the method comprising the steps of:
replacing a defective natural lens of an eye of a patient in need of such replacement with an interfacial refraction accommodating lens (IRAL);
permitting the IRAL to accommodate the patient's need to change the focal point of the eye by changing the diopter strength and thus the focal point of the IRAL;
wherein the IRAL employs immiscible liquids that define an optical interface and includes an implant sidewall at a perimeter of the interface; and
wherein the curvature of the optical interface depends on properties, namely, surface tensions, of the liquids and the implant material and changes responsive to a force that deforms or displaces the sidewall at the perimeter of the interface.
2. A method according to claim 1 wherein the IRAL diopter strength change occurs in response to ciliary muscle contraction.
3. A method according to claim 2 wherein the IRAL uses a piezoelectric response to change the interface.
4. A method according to claim 2 wherein the IRAL uses mechanical application of force to change the interface.
5. The method of claim 1 wherein the lens is configured such that a change in sidewall inclination changes the radius of the optical interface.
6. The method of claim 1 wherein the lens is configured such that the curvature of the optical interface adapts as the inclination of the sidewall changes.
7. The method of claim 1 , further comprising:
using haptics to transmit force from the eye muscle to the implant such that applied force deforms the sidewall.
8. The method of claim 1 , further comprising:
using haptics to transmit force from the eye muscle to the implant such that applied force displaces the sidewall.
9. The method of claim 1 , wherein the implant includes an optic chamber that contains the immiscible liquids, and the optic chamber includes a deforming hinge-like structure which is integrated into the implant.
10. The method of claim 1 , further comprising:
using haptics to transmit force from the eye muscle to the implant, the haptics being interiorly coupled to a moveable ring structure within the implant.