During accommodation for near vision, how does the eye increase its refractive power?

During accommodation for near vision, how does the eye increase its refractive power?

• A. Ciliary muscle relaxation reduces zonular tension, thickening the lens.
• B. Ciliary muscle contraction increases zonular tension, flattening the lens.
• C. Ciliary muscle contraction reduces zonular tension, thickening the lens, increasing refractive power.
• D. Iris constriction alters pupil size to adjust focus.

Answer: (C)