During near vision, the ciliary muscle contracts due to activation of the (sympathetic / parasympathetic) nervous system. As a result, the zonular fibers to go slack, which causes the refractive power of the lens to increase and the lens become rounder.

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The Answer of During near vision, the ciliary muscle contracts due to activation of the (sympathetic / parasympathetic) nervous system. As a result, the zonular fibers to go slack, which causes the refractive power of the lens to increase and the lens become rounder.

During near Vision, the Ciliary Muscle Contracts Due to Activation