Traumatic mydriasis


  • Pupillary dilation due to blunt eye trauma
    • Pupil is poorly reactive to light in both direct and consensual light exposure
  • Occurs due to small tears in the ciliary muscles
  • May be transient or permanent
  • No specific ED management, but requires ophthalmology follow up
  • Diagnosis of exclusion!

Clinical Features

Differential Diagnosis

  • Physiological Aniscoria
  • Intracranial Injury
  • Congenital Eye Defects
  • Drugs and Toxins
  • Third Nerve Palsy
  • Pharmacologic Mydriasis


  • History of Trauma
  • Check use of topical medications
  • Exposure to toxin and drugs
  • Evaluate ocular and neurological symptoms/signs
  • Examine pupils in light and dark



See Also

External Links