Accommodation for Near Vision

Steps:

• Vehicle starts distant, requiring relaxed ciliary muscles and flat lens for focus.
• As vehicle approaches, eye accommodates to track closer object.
• Accommodation involves ciliary muscles contracting to make lens more convex.
• This increases lens curvature, bending light more for sharp near focus.

Why C is correct:

• In accommodation, suspensory ligaments slacken, allowing lens elastic recoil to become more convex, per the near point of vision principle.

Why the others are wrong:

• A: Ciliary muscles contract (not relax) to enable lens convexity for near focus.
• B: Iris circular muscles contract for pupil constriction in bright light or near vision, not primary for distance change.
• D: Pupil constricts (becomes smaller) during accommodation for near objects.

Final answer: C