Constricted pupil

DDx

  • Opioids (pinpoint)
  • Other causes of sympatholytic poisoning, e.g., benzodiazepines, clonidine
  • Horner's syndrome
  • Myotic drugs, e.g., pilocarpine
  • Neurosyphilis (Argyll Robertson pupils)
  • Pontine infarct
  • Uveitis
  • Inflammatory adhesions between iris and lens (posterior synechiae)
  • Cholinergic poisoning, e.g., organophosphates
  • Physiologic anisocoria (unequal pupils, react normally)

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