Anisocoria: Large Pupil Abnormal
Unequal pupils where the larger one is abnormal; Normally, parasympathetics traveling w/CN3 cause pupilary constriction. Lesions to parasympathetics cause dilation and may impair other CN3 functions (e.g. EOMs, lid raising).
Cavernous Sinus Thrombosis
Aneurysm Posterior Communicating Artery
Adies (tonic) Pupil
Tumor Directly Affecting CN3
Stroke Affecting CN3
Physiologic anisocoria: Normal pupils can differ in size by <.4mm. Eye function and response to light will be normal.
Instillation of dilating drops into one eye - history should be revealing; inadvertent exposure of eye to anticholinergics as w/nebs from poor fitting mask hitting eye→ dilation
Prior eye surgery, trauma, injury to pupilary dilators/constrictors; history should be revealing; license/other pix to assess stability/newness is helpful; shouldn't have acute sx