Virtual reality glasses or goggles are becoming increasingly popular in the gaming and entertainment spheres. They are lighter and more comfortable to wear than the standard head-mounted display (HMD) and many of them incorporate a range of interactive devices.
Examples of these include audio, video, and head tracking. These glasses behave similarly to 3D glasses in that they display two images. Regular glasses display images, but 3D and virtual reality glasses or prescription glasses in VR contain polarized lenses that display two images, one for each eye.
These images seem to give the illusion of depth, which is a special characteristic of the CAVE environment. The technical name for this is stereoscopy.
More modern versions of these glasses have a head tracking system. The system is connected to a computer that sends signals to correct the image the user sees as it moves. This is also a special aspect of the fully immersive CAVE Virtual Reality.
These glasses allow the wearer to see three-dimensional images that create the illusion of depth perception. For example, if a user uses virtual reality for architectural purposes, he or she can see buildings from different angles and walk through or around them.
Many types of glasses have a tracking system that maps the user's movements and corrects the image accordingly. Every time the wearer moves his head, walks in a certain direction, or performs another action, the scene in front of him changes.
The tracking system is connected to a computer that adjusts these images so that the user is shown a realistic environment with a realistic depth of perception. The tracking must be as accurate as possible, otherwise, the illusion will collapse.