@nprofile1q...

I am not an expert, but for example this epilepsy website describes it as:

"...caused by being exposed to flashing or flickering lights or high contrasting patterns."

"Some people are sensitive to geometric patterns with contrasts of light and dark such as stripes or bars."

https://epilepsysociety.org.uk/about-epilepsy/epileptic-seizures/seizure-triggers/photosensitive-epilepsy

As far as I can tell this means it happens with specific kinds of animation/movement rather than all animation.