Anisocoria
More common causes
Uveitis
Peters' anomaly
Oculomotor nerve palsy
Less common causes
Trigeminal autonomic cephalalgia
Adie's syndrome
Coloboma
Acute angle-closure glaucoma
Horner's syndrome
Physiologic anisocoria
Aniridia
Iris trauma
Uncommon causes
Autoimmune autonomic ganglionopathy
Pharmacological causes
Atropine
Pilocarpine hydrochloride
Pregabalin
Tropicamide