This isn’t the first recent instance of a Disney movie coming with an epilepsy warning, as in last year’s Incredibles 2, the main villain, Screenslaver, hypnotized people through technology that used rapidly flashing lights. However, in that instance, the warnings were posted after Incredibles 2 came out, whereas with Star Wars: The Rise of Skywalker, Disney’s making sure the word is out early.
Article source: https://www.cinemablend.com/news/2486411/star-wars-the-rise-of-skywalker-is-warning-epileptics-about-strobe-sequences