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move content from VR
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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 head-mounted display]]s or [[OHMD]]s. 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 head-mounted display]]s or [[OHMD]]s. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes.
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+To create the illusion of depth, a display is placed very close to the users' eyes, covering their entire field of view. Two images that are very similar but have different perspectives are channeled into each eye to create [[parallax]], the visual phenomenon where our brains perceive depth based on the difference in the apparent position of objects.
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+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>
==Virtual Reality HMDs==
==Virtual Reality HMDs==