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During cataract surgery, a circular opening is cut in the anterior part of the lens capsule so the surgeon can remove the eye's natural lens that has become cloudy. The peripheral and posterior portions of the lens capsule are left intact, forming a partially open "bag" that the intraocular lens is positioned within to restore focusing power to the eye.

All IOLs have a central optical zone, with peripheral "legs" (called haptics) that secure the lens implant inside the lens capsule.

Also, the added cost of these presbyopia-correcting IOLs typically is not covered by Medicare or private health insurance.

As the eye ages, the lens becomes less flexible, causing the loss of near vision that is the hallmark sign of presbyopia in people over age 40.

When the ciliary muscle is relaxed, the lens flattens to enable clear distance vision.

When the ciliary muscle contracts, the lens thickens, becoming more curved for added magnification for clear near vision.

Accommodation is made possible by the lens inside the eye and the circular muscle that surrounds the lens, called the ciliary muscle.

The lens and ciliary muscle are connected by a 360-degree series of fibers (called ciliary zonules) that extend from the ciliary muscle to the thin lens capsule (or "bag") that encloses the lens.

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