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Table 1: Type of hallucination
Feature Possible Cause
Monocular Eye disease or optic nerve proximal to optic chiasm
Limited visual field Focal lesion in visual pathway
Simple, brief, unformed Eye disease, migraine, seizure, calcarine lesions
Visual distortion Seizures, CJD
Lilliputian Delirium, intoxication, withdrawal
Frightening Delirium, hallucinogens, psychosis
Unconcerned/preserved insight Charles Bonnet syndrome, peduncular hallucinosis

Feature	Possible Cause
Monocular	Eye disease or optic nerve proximal to optic chiasm
Limited visual field	Focal lesion in visual pathway
Simple, brief, unformed	Eye disease, migraine, seizure, calcarine lesions
Visual distortion	Seizures, CJD
Lilliputian	Delirium, intoxication, withdrawal
Frightening	Delirium, hallucinogens, psychosis
Unconcerned/preserved insight	Charles Bonnet syndrome, peduncular hallucinosis