<P> 3D cinema has been used for sporting events, pornography, fine art, music videos and short films . Since 2015, virtual reality has been installed onto a number of roller coasters and theme parks . </P> <P> In robotics, virtual reality has been used to control robots in telepresence and telerobotic systems . </P> <P> In social sciences and psychology, virtual reality offers a cost - effective tool to study and replicate interactions in a controlled environment . </P> <P> Surgery training can be done through virtual reality . Other medical uses include virtual reality exposure therapy (VRET), a form of exposure therapy for treating anxiety disorders such as post traumatic stress disorder (PTSD) and phobias . In some cases, patients no longer meet the DSM - V criteria for PTSD after a series of treatments with VRET . </P>

Who built the first digital vr system and in which year