seizure late-onset benign occipital seizure true Seizures manifest with visual hallucinations and/or blindness, they are frequent, mainly diurnal lasting from seconds to less than three minutes. They may progress to other seizure manifestations, mainly hemiconvulsions. Loss of consciousness may occur with or without convulsions. A postictal headache occurs in 30% of patients. Mean age at onset is 7–8 years, and prognosis is usually good with remission often occurring within two to three years. Late onset childhood occipital epilepsy (Gastaut type)