I didn’t have any pain or headaches. I wasn’t even expecting to since it’s a very different implementation. My vision was a bit odd though. Hard to describe, but a bit afterward I was looking at some stuff on my dining room table and my vision was wavering, like looking at heat shimmers off a hot road in summer. I can’t say if it was due to the IR or not. I never had that before or since, though. It is just something I’d be paying attention to with my own kids, if they want to use animoji for any length of time like making a karaoke or something. I doubt one or two in a text would cause any issues.