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[[Simulator sickness]] of '''VR sickness''' is a type of visually induced motion sickness that occurs when using [[VR]] and [[AR]] devices. The [[#Symptoms|symptoms]] of simulator sickness include dizziness, headache, nausea, vomiting and other discomforts. Simulator Sickness occurs when the VR devices fails to completely fool our vestibular and proprioceptive systems, the sensory systems responsible for balance, spatial orientation and bodily positions. It is [[#Causes|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 simulator 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. Simulator 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 simulator sickness.