Exam

Mydriasis

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Mydriasis, Pupil Dilation, Pupil Dilitation, Unilateral Dilated Pupil, Blown Pupil

  • Physiology
  • Normal Response
  1. Sympathetic stimulation
  2. Dark lighting conditions
  3. Images
    1. EyePupillaryReactionNeuroPath.png
    2. EyePupillaryReaction.png
  • Causes
  • Unilateral Dilated Pupil
  1. See Also Anisocoria
  2. Comatose patient with non-reactive dilated pupil (Blown Pupil)
    1. Indicative of Brainstem Herniation
  3. Alert patient
    1. Not due to Increased Intracranial Pressure
    2. Acute Glaucoma
    3. Mydriatic drug (e.g. Atropine)
    4. Cranial Nerve III paralysis
      1. Posterior Communicating Artery aneurysm
  • Causes
  • Dilated pupil does not constrict with Pilocarpine
  1. Local Eye Trauma
  2. Topical Anticholinergic Agent present in eye