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virtual reality : an artificial environment which is experienced through sensory stimuli (as sights and sounds) provided by a computer and in which one’s actions partially determine what happens in the environment (special hardware & software used in concert) — Webster See also OneLook, Free Dictionary
Virtual reality (VR) is a term that applies to computer-simulated environments that can simulate physical presence in places in the real world, as well as in imaginary worlds. Most current virtual reality environments are primarily visual experiences, displayed either on a computer screen or through special stereoscopic displays, but some simulations include additional sensory information, such as sound through speakers or headphones. Some advanced, haptic systems now include tactile information, generally known as force feedback, in medical and gaming applications. Furthermore, virtual reality covers remote communication environments which provide virtual presence of users with the concepts of telepresence and telexistence or a virtual artifact (VA) either through the use of standard input devices such as a keyboard and mouse, or through multimodal devices such as a wired glove, the Polhemus, and omnidirectional treadmills. The simulated environment can be similar to the real world in order to create a lifelike experience—for example, in simulations for pilot or combat training—or it can differ significantly from reality, such as in VR games. — Wikipedia
The Sword of Damocles
Sega VR Headset
You can get a sense of what the Virtual Boy was like even if you don’t have one. Recently redditor calling himself “King of Spain” posted a Virtual Boy emulator for Google’s Cardboard. Here is a head-ache inducing video to give you a sense it.
Emulating Virtual Boy in 3D on Gear VR/Google Cardboard (The-King-of-Spain)
A redditor is using Google Cardboard to give Virtual Boy games a new life (Ricky Berg, Nintendo Inquirer)
Virtual Boy (eBay)
Nintendo’s Virtual Boy (Wikipedia)
Here are links to pages about closely related subjects.
These are types of media formats.