Table 1.

Features of Visual Hallucinations Indicative of Etiology

Features of Visual Hallucination	Most Likely Etiologies
Simple patterns, spots, shapes, or lines; unilateral distribution; associated with headache	Migraine, seizure, tumor
Macropsia, micropsia, metamorphopsia	Seizure, Creutzfeldt-Jakob disease
Associated with going to, or waking from, sleep	Hypnagogic or hypnopompic hallucinations
Confabulation of all vision	Anton's syndrome
Frightening content	Psychotic disorder, delirium, hallucinogenic drug
Good insight	Charles Bonnet syndrome, migraine, peduncular hallucinosis