shutter glasses and head mounted displays

Shutter glasses are one mechanism to present alternate images to the eyes. These glasses first block the picture to one eye at a time, in synchronization with two different perspectives alternatively shown on a monitor. When the alternating perspective images are displayed in quick enough order, then the brain integrates them into a single 3D image. head mounted displays usually have some type of shutter glasses within a head device and screen displays that are relatively close to one's eyes. The close computer displays make it easier to span much of the scope of vision (e.g. over 60 degrees), but requires fine-resolution imaging. The head device may be: physically attached to an armature for tracking head motion; or physically unconnected with head motion tracked by optical, magnetic, or ultrasonic monitors. Sub-page Digital Humans covers more information on this topic.

Sight is probably the single most vital sense through which humans learn about their setting, but interaction is a two-way street. Not only do human beings receive information from their setting, but humans also modify their setting. This is true in virtual worlds as well as the real world. Vision may be paramount in interaction from computers to humans, but motion and touch (called "kinesthetics") currently dominate interaction from people to computers. Human-to-computer interaction based on hand and body movement is much farther developed than information transferral from humans to computers based on eye motion. See Virtual Tours Wyoming for more about virtual reality.

Linked page Virtual Robots also deals with such virtual reality technologies.