The accommodative ability changes greatly because of age-related changes in the eye, including a decrease in the elasticity of the lens and the degeneration of the Zonular fibers and the ciliary muscles surrounding the lens.
The process of accommodation, or focusing on near objects, happened by a concerted action of the ciliary muscle on the zonule fibers which hold the lens in place. The ciliary muscle can be described as a ring of smooth muscle that, upon contraction, relaxes the tension on the zonular fibers and allows the lens to become more spherical.
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