Accommodation for Near Vision

Steps:

• To focus on near objects, the eye increases lens curvature for greater refraction.
• Ciliary muscles contract to pull on the choroid, reducing tension.
• Suspensory ligaments loosen as a result.
• The elastic lens rounds out, converging light rays effectively.

Why A is correct:

• In accommodation, ciliary muscle contraction loosens suspensory ligaments, allowing the lens to become rounded, as per the mechanism of emmetropia adjustment.

Why the others are wrong:

• B: Lens thins and ligaments tauten during relaxation for distant vision.
• C: Ciliary relaxation occurs for far objects, not near.
• D: Muscle relaxation with thin lens and taut ligaments suits distance focusing.

Final answer: A