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Fixation-off sensitivity in idiopathic childhood occipital epilepsy of Gastaut

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Occipital paroxysms occur as long as fixation and central vision are eliminated by any means (eyes closed, darkness, +10 spherical lenses, Ganzfeld stimulation). Under these conditions, eye opening cannot inhibit the spikes. Symbols of the eyes open or closed without glasses denote that the recording was made with the lights on and whenever fixation was possible. Symbols of the eyes open or closed with glasses denote that the recording was made when fixation and central vision were eliminated by any of the above means. (Used with permission from: Panayiotopoulos CP. Reflex seizures and related epileptic syndromes: a clinical guide to epileptic syndromes and their treatment. Revised 2nd ed. London: Springer, 2010:497-531.)