One of the issues could be eye strain. The main cause of eye strain is wrong set up of Interpupillary Distance (IPD) when wearing HMD. All our headsets have manual option to set correct IPD to suit the user. The IPD value ranges from 58mm to 63mm (ages 8+). To minimise the eye strain, we also recommend not to exceed 1 hour of game play.
Some people may experience motion sickness in VR. The motion sickness happens when your brains receives conflict signals about movements in virtual environment by using locomotion system. Locomotion in VR is when user's avatar is moving through the virtual environment (by walking/running or riding a vehicle) while the body is stationary. That may disturb your vertigo or the brain’s equilibrium and you start to feel nauseous. In order to mitigate this issue, we making game recommendations and gradually introduce virtual reality to our customers depending on their level of experience in VR.