Aree visual hallucinations triggered by fear?

Not likely.: Visual hallucinations can be triggered by sleep deprivation, drugs, temporal lobe epilepsy, ; severe psychiatric illnesses. Seizures in the primary visual cortex of the brain may cause simple seizures like shadows, ; seizures in the visual association areas may cause more elaborate ones loss of sensory input from the eyes i.e. Nerve damage ; lesions in the brainstem can also cause them.