metrognome
photosensitive epilepsy is only triggered by a certain flash rate. Per the link I provided:
‘ Even in predisposed individuals, many factors must combine to trigger the photosensitive reaction.
Examples include:
•frequency of the flash (that is, how quickly the light is flashing)
•brightness
•contrast with background lighting
•distance between the viewer and the light source
•wavelength of the light
•whether a person’s eyes are open or closed
The frequency or speed of flashing light that is most likely to cause seizures varies from person to person. Generally, flashing lights most likely to trigger seizures are between the frequency of 5 to 30 flashes per second (Hertz).’
…
•the flash rate be kept to under 2 Hertz with breaks every so often between flashes…’
This isn’t rocket surgery.