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The majority of [[Virtual Reality]] (VR) and [[Augmented Reality]] (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. These HMDs are called optical see through head mounted displays (OST-HMD). Video passthrough can also be done. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.

The majority of [[Virtual Reality]] (VR) and [[Augmented Reality]] (AR) devices are head-mounted displays. In AR, the display is usually transparent and digital information is superimposed onto real life objects. These HMDs are called optical see through head mounted displays (OST-HMD). Video passthrough can also be done. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.

To create the illusion of depth, a display is placed very close to the users' eyes, covering a large portion of their field of view. Most headsets are flat focus stereoscopic, meaning two images that are very similar but have different perspectives are channeled into the eyes, one for the left and one for the right, to allow the human perceptual system to perceive [[binocular disparity]] and see some depth.

To allow the perception of depth, a display is placed very close to the users' eyes, covering a large portion of their field of view. Most headsets are flat focus stereoscopic, meaning two images that are very similar but have different perspectives are channeled into the eyes, one for the left and one for the right, to allow the human perceptual system to perceive [[binocular disparity]] and see some depth.

Specialized lenses are placed between the display and our eyes. The lenses allow our eyes to focus on the images on the display, even though the display is only a few inches in front of our faces. Without lenses, our entire VR world would become blurry because human eyes have trouble focusing on things that are very close.<ref>http://doc-ok.org/?p=1360</ref>

Specialized lenses are placed between the display and our eyes. The lenses allow our eyes to focus on the images on the display, even though the display is only a few inches in front of our faces. Without lenses, our entire VR world would become blurry because human eyes have trouble focusing on things that are very close.<ref>http://doc-ok.org/?p=1360</ref>