1 + 2 = if you use stereo 3D routinely and intensively, you will develop strabismus, period.

What this means is that shutterglasses+LCD TVs, VR helmets, polarized projection with passive glasses, and all autostereoscopic (no glasses) methods like Cubicvue's color filter barrier, parallax barrier, and lenticular arrays, are ALL DANGEROUS TO YOUR HEALTH unless used sparingly.

Yeah, it's just a post on some discussion forum, but it includes a couple of interesting links that, allegedly, back up its claims.