What kinds of flashing lights can trigger seizures?
Not all flashing lights or visual patterns will trigger a seizure, even in individuals who are photosensitive. The rate of the flashing light,the duration of the flashing, and the intensity of the light all play a part. A flash at a frequency of between 15 and 20 flashes per second is most likely to cause a seizure, whereas very few people are sensitive to a rate of 3 flashes per second Recent advances in the electronics industry exposes many people to a wide range of equipment with flickering or variable light conditions. These may cause problems for the person with photosensitive epilepsy. But natural sources, like the effect of sunlight through trees or dazzling reflections off water, are also known seizure triggers.
