You don’t know that.The screen is the culprit
Samsung IR scanners caused eye pain and migraines for a minority of users. When Apple announced the X, I was waiting for the explosion of reports of eye pain/headaches. People have never had IR lasers blasted into their eyes up to 100 times a day before. I feel safer taking a wait and see approach with this tech, since retinal damage does not repair itself over time. You only have one set of eyes.