Patterns are more likely to be a trigger if they are changing direction or flashing, rather than if they are still or moving slowly in one direction.įlashing, flickering or patterned effects can make people with or without epilepsy feel disorientated, uncomfortable or unwell. Some people are sensitive to geometric patterns with contrasts of light and dark such as stripes or bars. While some people are sensitive at frequencies up to 60 hertz, sensitivity under 3 hertz is not common. What rate of flashing light can trigger seizures?īetween 3-30 hertz (flashes per second) are the common rates to trigger seizures but this varies from person to person. If this causes any changes in brain activity, the technician can stop the flashing light before a seizure develops. This involves looking at a light which will flash at different speeds. This is when you have a seizure straightaway, caused by being exposed to flashing lights or patterns. An electroencephalogram EEG can help with diagnosis, and may include testing for photosensitive epilepsy. Photosensitive epilepsy is more common in children and young people (up to 5%) and is less commonly diagnosed after the age of 20. This is when seizures are triggered by certain rates of flashing lights or contrasting light and dark patterns. This does not necessarily mean they have photosensitive epilepsy.Īround 1 in 100 people has epilepsy and of these people, around 3% have photosensitive epilepsy. Flashing or patterned effects can make people with or without epilepsy feel disorientated, uncomfortable or unwell. Photosensitive epilepsy is not common but it may be diagnosed when you have an EEG test. Photosensitive epilepsy is when seizures are triggered by flashing lights or contrasting light and dark patterns. Queen’s Memorial Fund & book of condolences.
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