Interesting question. The same technology (IR laser projector) is used inside Microsoft's kinect (except they use a stronger projector), and people play that fo

Interesting question. The same technology (IR laser projector) is used inside Microsoft's kinect (except they use a stronger projector), and people play that for extended periods of time, so definitely not the first consumer electronic to use this type of technology. There are so many different things that can give you headaches (diet, hydration, sleep, stress, neurological issues, etc), it can be challenging to pin this down. I'd say it's more likely something else. Additionally, I find I get headaches from staring at tiny screens too long in general. I hope you feel better soon!