Idiopathic generalized tonic-clonic epilepsy and photosensitivity: a long-term follow-up study.

Photosensitivity is an abnormal visual sensitivity of the brain in reaction to flickering light sources or patterns and is expressed in the electroencephalogram (EEG) as a generalized spike-polyspikes and wave discharge (photoparoxysmal response, PPR) elicitated by intermittent photic stimulation (IPS), and in more susceptible individuals as clinical seizures. The prevalence of photosensitivity in patients with epilepsy ranges from 2 to 20%, and it is also possible to find it in non-epileptic individuals. It is more commonly associated with idiopathic generalized epilepsy (IGEs) who corresponds to 20–40% of all epilepsies