I do suffer from vestibular migraines only if the a display is flickering at below 50 hertz. The more I stare at it, the worse is the spinning dizziness. Its rare but I do suffer ocular migraine from staring at monitors with a constant backlight flickering at 60 ~ 120hz(Not referring to PWM here). I owned two Dell monitors, 1 24 inch and the other with 27 inch. In reviews, they were said to be flicker free. However, I quickly got red, dry and sore eyes within minutes of looking at the screen. Next, I'll get ocular migraine.
(btw, ocular migraine is a migraine that also affects your eyes visual causing temporary visual distortion.)
Once, I used my iphone and turned on video recording on the dell monitors up closed. I was able to see a constant faint grey pulsing, and this constant pulse is very different from PWM.
The results I saw really resembles what was reported from NotebookCheck on Galaxy Tab A 10.1. No PWM but a constant backlight flicker pulse at 60hertz.
https://www.notebookcheck.net/Samsung-Galaxy-Tab-A-10-1-2019-Tablet-Review.422775.0.html