How can fast changing colors cause seizures for people with epilepsy?

Possibly: Some people are have photosensitive seizures, caused not necessarily by changing color but the flicker frequency of the changes. This was previously called tv epilepsy, but new screens do not cause this. Consult a neurologist who may suggest medication and a particular frequency of blue sun glasses that makes the likelyhood of seizures less likely. Also avoid flickering lights.