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The majority of [[virtual reality]] (VR) and [[augmented reality]] (AR) gadgets are head-worn computers. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes. 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.
The majority of [[virtual reality]] (VR) and [[augmented reality]] (AR) gadgets are head-worn computers. In VR, the display is not transparent and only virtual information and images are displayed in front of wearer's eyes. 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.
+[[VR headset]]s with flat focus have lenses that are placed between the display and the user's 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>
==References==
==References==
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