Miosis

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Definition

-  Pupil constriction

-  Unilateral = aniscoria

 

Features

-  Parasympathetics constrict pupil

 

Causes

-  Horners Syndrome: ipsilateral

-  Intracranial haemorrhage

-  Cluster Headache w ptosis

-  Iridocyclitis

-  Meds

-  Ketamine

-  Opiates: Morphine, Oxycodone, Fentanyl, Methadone, Heroin

-  Antipsychotics: Haloperidol, Olanzapine, Quetiapine

-  Mirtazapine

-  Organophosphates

-  BZDs

 

Associated S/S

-  Unilateral = aniscoria

-  Horners Syndrome

-  Miotic topical meds (unless in both eyes)

-  Intracranial bleed (via block of CNII parasymp)

-  Bilateral: non-topical meds