Photosensitive Epilepsy |
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If you are designing any system with blinking lights or LEDs then keep Photosensitive Epilepsy in mind.
These quotes come from the website of the British Epilepsy
Association:
http://www.epilepsy.org.uk/info/photofrm.html:
- "It should be bore in mind that people with photosensitive
epilepsy are unlikely to be troubled by a flicker rate of under
five per second"
- "Only 50% of photosensitive people are sensitive to 50Hz but
75% are sensitive to 25Hz"
- "100Hz television sets will almost entirely solve the
problem"
This quote comes from the website of the National Society for Epilepsy
(UK):
http://www.epilepsynse.org.uk/pages/info/leaflets/photo.cfm:
- "The frequency of flashing light which is most likely to
provoke seizures varies from person to person. Generally, it is
between the frequencies of 5-30 flashes per second (hertz).
Some people, however, are photosensitive at higher flash
frequencies. It is uncommon to have photosensitivity below 5
hertz."
Avoid LED blinking or modulation at rates between 5 and 100Hz.