Common triggers for a Photosensitive Epilepsy Seizure include:
* Viewing a television screen, playing a video game/using other computer graphics
* Having a faulty television or other light source which flickers at a slow frequency
* Sunlight through a line of trees
* Looking out of a window in a train
* Sunlight on water
* Stroboscopic lights
* Looking at a moving escalator
.
Sometimes people are also sensitive to various geometric shapes or patterns,
for example, stripes or checks.
* the frequency of the stimulus
* the intensity of the stimulus
* the background illumination
* the wave length of the light
* whether the person's eyes are opened or closed or in the act of opening and closing
.
Usually people with epilepsy will also have had seizures both with and without flashing
light. There are some people who only have seizures due to this trigger.
