In the next few months, even this week alone, expect to hear a lot about virtual and augmented reality products. Oculus and HTC/Valve are set to launch their respective headsets in a month or two. Google has just stepped up its Cardboard marketing and retailing. Coca-Cola is mulling over recycling its packaging into VR headsets, but Sweden's McDonald's may have already beaten them to the punch. But more than any other consumer technology in the past decade, from smartphones to wearables, VR perhaps presents the most health questions. While the answer are still murky at this point, they all revolve on how the quality of a VR product, both hardware and software, largely determines the effects it will have on your body.