Simulator sickness

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Motion Sickness or Simulator Sickness is the feeling of dizziness, headache, nausea, vomiting and other discomforts when using a VR or AR device. In virtual reality, 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. In other words motion sickness from VR is developed when what our eyes see does not match how our heads move. Even minute discrepancy can cause these unpleasant sensations. 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.

Gabe Newell from Valve has claimed that its HTC Vive, unveiled in GDC 2015, is the first VR Device that has eliminated motion sickness from its users. HTC Vive has Lighthouse Motion Tracking system that utilizes lasers to improve the accuracy of the head tracking to under 1/10 of a degree.