Accommodative intraocular lens system
A two-optic accommodative lens system is disclosed. Two coupled lenses are located within the capsular bag to extend depth of focus and/or restore accommodation following extraction of a natural lens. The first lens comprises a spring-like structure attaching an optic to a ring-like support structure. The optic can be a monofocal or multifocal optical element having a positive or negative power. The first lens further comprises features designed to couple the ring-like structure to a second lens. The first lens can be located anteriorly within the capsular bag. The second lens is located posteriorly to the first lens within the capsular bag and can have an opposite or supplementary power to that of the first lens. The second lens can also be a monofocal or multifocal lens and comprises a plurality of haptics which can be used to size the lens system over a range of capsular bag sizes. The second lens further comprises features for coupling the second lens to the ring-like structure of the first lens. The haptics of the second lens are relatively firm, yet still flexible and can be configured to interlock with features of the ring-like structure.
1. An accommodative intraocular lens system, comprising:
a) a first lens comprising a first optic, a circular support ring having one or more interlock features, the circular support ring comprising an anterior surface, a posterior surface, and a circular wall extending between the anterior surface and the posterior surface, the interlock features comprising a plurality of notches formed in the circular wall at the posterior surface of the circular support ring, and an attachment structure, the attachment structure coupling the first optic to the circular support ring; and
b) a second lens comprising a second optic and a plurality of haptics, the haptics configured to fit into and fill the notches on the posterior surface of the support ring to couple to the circular support ring at one or more of the interlock features, wherein the haptics extend beyond the support ring when the support ring is coupled to the second lens and wherein the circular support ring is a single ring configured such that when coupled with the second lens the posterior surface of the circular support ring and said haptics contact a posterior side of a capsular bag in an uninterrupted manner when implanted within an eye.
2. The lens system of claim 1 , wherein the first lens and the second lens comprise a soft acrylic material.
3. The lens system of claim 1 , wherein at least one of the first and second lenses comprise a hydrogel material or a silicone material.
4. The lens system of claim 1 , wherein when the first lens and the second lens implanted and coupled in an eye, the interlock features distribute forces applied to the haptics of the second lens so that the first optic responds to changes in the geometry of the eye capsule by moving axially to provide a range of accommodation.
5. The lens system of claim 4 , wherein the range of accommodation is between about 1 diopter and about 4 diopters.
6. The lens system of claim 1 , wherein the second lens and the support ring couple to form a continuous barrier to lens epithelial cell proliferation.
7. The lens system of claim 1 , wherein the first lens is a monofocal lens, a multifocal lens or a varifocal lens.
8. The lens system of claim 1 , wherein the second lens is a monofocal lens, a multifocal lens or a varifocal lens.
9. The lens system of claim 1 , wherein the second lens is a two-point fixated lens.
10. The lens system of claim 1 , wherein the interlock features comprise a ball-detent interlock.
11. The lens system of claim 1 , wherein the interlock features comprise a tongue and groove interlock.
12. The lens system of claim 1 , wherein the second optic has an opposite or supplementary power to that of the first optic.
13. The lens system of claim 1 , wherein the first optic and second optic have optical powers selected to provide a range of accommodation between about 1 diopter and about 10 diopters.