VDUs usually operate at a sufficiently high frequency that they do not provoke seizures, even in people with photosensitivity. Nevertheless, there are rare examples of people with sensitivity to high flash frequencies. Playing computer games very rarely triggers epileptic seizures in people without a known history of epilepsy. Those people who do have a seizure for the first time when playing video games usually have an unrecognised susceptibility to seizures triggered by flashing light, that is, most of them are photosensitive. Ordinary coloured lights do not usually cause a problem if they do not flash, however, stroboscopic lights can trigger seizures, particularly if the background illumination is low and there may be other environmental triggers e.g. stress, excitement, tiredness etc.
Some local authorities do have rules concerning the flash frequency of strobe lighting.
The local Environmental Health Department will be able to give you more information on this. Unfortunately, if a person is known to be photosensitive it may be best to avoid the hazard of stroboscopic disco lights. Seek individual advice from your specialist as the risks of seizures vary from person to person. Change channels on the TV using a remote control to avoid going too close to the screen. Avoid looking at poorly tuned channels or faulty TVs.