The ciliary muscle is a
smooth muscle that affects
zonular fibers in the
eye (fibers that suspend the
lens in position during
accommodation), enabling changes in lens shape for light focusing. When the ciliary muscle contracts, it releases the tension on the lens caused by the zonular fibers (fibers that hold or flatten the lens). The release of tension of the zonular fibers causes the lens to become more spherical. Therefore, relaxation of the ciliary muscle causes the zonular fibers to become taut, flattening the lens, increasing long range focus.
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