Virtual reality sickness
occurs when exposure to a virtual environment
causes symptoms that are similar to motion sickness
The most common symptoms are general discomfort, headache, stomach awareness, nausea, vomiting, pallor, sweating, fatigue, drowsiness, disorientation, and apathy.
Other symptoms include postural instability
Virtual reality sickness is different from motion sickness in that it can be caused by the visually-induced perception of self-motion; real self-motion is not needed.
It is also different from simulator sickness; non-virtual reality simulator sickness
tends to be characterized by oculomotor
disturbances, whereas virtual reality sickness tends to be characterized by disorientation.