Causes of a dilated pupil
| Unilateral Trauma Optic neuritis Tonic pupil (Adie pupil) Acute angle-closure glaucoma Local contamination with drugs such as albuterol, stimulants (cocaine, amphetamine), anticholinergics (scopolamine, atropine, hycosamine) Compression of cranial nerve III Uncal herniation Posterior communicating artery aneurysm |
| Bilateral Systemic disease (eg, botulism, paraneoplastic syndrome, Miller Fisher variant of acute inflammatory demyelinating polyneuropathy) Systemic drugs (eg, selective serotonin reuptake inhibitors, serotonin-norepinephrine reuptake inhibitors, stimulants such as cocaine and amphetamine) Midbrain injury |
| Transient Unilateral episodic mydriasis Seizures Migraine |