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pp.153-162
There are 3 types in the technology of Virtual Reality(VR). whlch are desk-top type, projection type and HMD type. and its development has been motivated by HMD and connected tracking devices with it. As Virtual Reality is that observers perceive a virtual environment structured by computer as a reality through man's all senses, it is known that 80% or more information is received by visualization. Virtual stereoscopic display is divided into glasses and non-glasses types depending on whether observers need to require the glasses additionally and Lhere are HMD, shutter, polarized, color difference methods in the glasses' type. Adverse side- effects while immersed in VR or after VR are divided into visual ones resulting from vestibular-visual conflicts and non-visual ones resulting from instrument myopia, disagreement between accommodation and convergence etc. As stereopsis is well adapted by time going, non-visual side-effects are tend to reduce while visual ones a re not, it is necessary to have an effort to follow- up their causes and eliminate them.
