Not used as commonly as video monitors (primarily due to cost issues), VR goggles are sometimes used in research or location based games, where the cost of equipment can be offset institutionally or distributed over a pool of players that pay each time they play. Using two ocular monitors (one for each eye), VR goggles can provide slightly different images to each eye, simulating the depth perception people experience in daily life. Such goggle setups can also be used in conjunction with head tracking hardware to provide players a view of a virtual landscape which they can move by turning their heads.
Weak example Virtual boy With it's Virtual Boy, Nintendo attempted to bring three-dimensional visuals to the mass market. The Virtual boy provided a different picture to players' left and right eyes in order to create a three dimensional visual environment.