Formed visual hallucinations are seen in lesion of

Hallucinatory voices may occur in ear disease and visual hallucinations in diseases of the eye, but often there is some disorder of the central nervous system as well. For example, a woman aged 66 suffered from glaucoma and then began to have continuous(formed) visual hallucinations. At the time she showed evidence of atherosclerotic dementia and had a focus of abnormal activity in the left posterior temporal lobe. Reference: Fish clinical Psychopathology, page no. 20.