Generalized-onset tonic-clonic seizures that are provoked by flashing or flickering light. The phenotype is Photosensitive tonic-clonic seizure (HP_0007207, a Human Phenotype Ontology identifier). Also known as: Photically induced tonic-clonic seizure, Photosensitive tonic-clonic seizures, Seizures, tonic-clonic, photosensitive.