Accommodating intraocular lens providing progressive power change

1. An accommodating intraocular lens (IOL) having an optical axis extending from an anterior pole to a posterior pole, the accommodating intraocular lens comprising:

an outer lens enclosure having an anterior structure comprising an anterior capsular-engaging surface configured to reside adjacent an interior anterior surface of an evacuated capsular bag and a posterior structure comprising a posterior capsular-engaging surface configured to reside adjacent to an interior posterior surface of the evacuated capsular bag, the anterior surface and the posterior surface of the outer lens enclosure extending to and being joined at an equatorial zone of the intraocular lens;

a first inner core within the outer lens enclosure, the first inner core having an anterior zone and a posterior zone, the anterior and posterior zones of the first inner core being disposed adjacent to the outer lens enclosure; and

a second inner core within the first inner core, the second inner core having an anterior zone and a posterior zone, the anterior and posterior zones of the second inner core being adjacent to the first inner core; and

an innermost core within the second inner core and disposed between the anterior zone and the posterior zone of the second inner core;

wherein the intraocular lens is deformable by ciliary muscle action when positioned in the evacuated capsular bag such that the outer lens enclosure, the first inner core, and the second inner core are deformed by progressively increasing ocular force, the intraocular lens having an unaccommodated state in which the intraocular lens provides a base optical power and an accommodated state in which the outer lens enclosure, the first inner core, and the second inner core each provide an add power,

wherein the hardness of the accommodating intraocular lens across the optical axis initially increases and then decreases from the outer lens enclosure to the innermost core,

wherein the refractive index of the accommodating intraocular lens across the optical axis initially increases and then decreases from the outer lens enclosure to the innermost core,

wherein the initial increase in hardness is a gradual increase across a width of each of the outer lens enclosure and the first inner core,

wherein the initial increase in refractive index is a gradual increase across a width of each of the outer lens enclosure and the first inner core,

wherein the outer lens enclosure, the first inner core, the second inner core, and the innermost core each provide up to 1 diopter of add power in the fully accommodated state, and

wherein the outer lens enclosure, the first inner core, the second inner core, and the innermost core are arranged concentrically within the IOL as gradually reducing spheres within the internal volume of the IOL.

2. The accommodating intraocular lens of claim 1 , wherein each of the zones anterior and posterior to the innermost core comprises a lower refractive index than the innermost core, and the outer lens enclosure comprises an index of refraction that is less than at least one of the zones of the first or second inner cores.

3. The accommodating intraocular lens of claim 1 , wherein index of refraction and hardness of at least two of the outer lens enclosure, the first inner core and the second inner core vary within the intraocular lens.

4. The accommodating intraocular lens of claim 3 , wherein:

a first interface is provided between the anterior structure and the anterior zone of the first inner core;

a second interface is provided between the anterior zone of the first inner core and the anterior zone of the second inner core; and

a third interface is provided between the anterior zone of the second inner core and the innermost core.

5. The accommodating intraocular lens of claim 1 , wherein:

an interface is provided within the outer lens enclosure and an antireflective coating is disposed on said interface.