Simulator sickness

Motion Sickness is the feeling of dizziness, headache, nausea, vomiting and other discomforts. In VR, Motion Sickness is caused by the discrepancies between the motion perceived from the screen of HMD and the actual motion of the user's head and body. Motion Sickness is one of the major problems to the wide adoption of Virtual Reality. As hardware and software improve, VR Devices hope to reduce and eventually eliminate Motion Sickness.

Valve has claimed that its HTC Vive, unveiled in GDC 2015, is the first VR Device that has eliminated motion sickness from its users.