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Paper I — 2024 June (Supplementary) (2019 Scheme) — Q13

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Paper I
2024 June (Supplementary) (2019 Scheme) · 100 marks · 180 min

Question

Atropine / Phenylephrine for refraction testing.

Q130.2 marksShort Answers

Answer

Atropine is the appropriate choice — an antimuscarinic that produces both mydriasis and cycloplegia (paralysis of accommodation), and accurate refraction testing specifically requires the eye’s accommodative reflex to be paralyzed so the true, unaccommodated refractive error can be measured. Phenylephrine, a pure alpha-1 agonist, produces mydriasis alone with no cycloplegic action, so it dilates the pupil without paralyzing accommodation — insufficient for refraction testing, though useful for fundoscopy alone.

  1. 1Cholinergic System

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