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MBBS QUESTION #10285
Question 1
Accommodation of the eye for near vision involves parasympathetically-mediated contraction of the ciliary muscle. This causes which change, allowing the eye to focus on nearby objects?
  • The lens flattens and becomes thinner, reducing its refractive power
  • Ciliary muscle contraction relaxes tension on the zonular (suspensory) fibers, allowing the elastic lens to become more spherical/convex and increase its refractive power✔️
  • The pupil dilates maximally, with no change in lens shape
  • Corneal curvature alone increases, with the lens remaining unchanged
Correct Answer Explanation
Parasympathetic stimulation contracts the ciliary muscle, which reduces tension on the zonular fibers suspending the lens; the inherently elastic lens then becomes more rounded (convex), increasing its refractive power to focus on near objects — a process that weakens with age (presbyopia) as the lens loses elasticity.