VIRTUAL reality set-ups need a computer, console or smartphone to run the app or game, a headset which presents a display before your eyes – which can be the phone's display – and input such as head or hand tracking.

The tracking system connected to a computer adjusts images so that the wearer is shown a realistic environment with a realistic depth of perception.

The tracking needs to be as accurate as it can be or else the illusion breaks down.

Glasses and headsets enable the wearer to see three-dimensional images such as being able to view a high building at different angles and the sense of moving through the structure.

The glasses enable the wearer to see two separate images which the brain combines into one.

Virtual Reality Society website said this is what gives the illusion of 3D depth, often accompanied by sounds which add to the experience.