I've said it before and I'll say it again, if you get headaches from it, turn the 3D down, that's the whole reason it's adjustable, so you can make it comfortable to you because everyone sees 3D differently. Unfortunately, people seem to think that the higher the slider, the better the effect, so they always try to keep it all the way up. Articles like that don't help with that misconception, when it says that nobody wants to lower the "quality" of the 3D effect.