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Edit by Brett Hartt

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[* black] When the knob on the top of the Virtual Boy is rotated to adjust the inter-pupil distance (the center to center distance between pupils), the two display units move closer or further away from each other.
[* black] When the focus slider is slid back and forth, the the lens in each display unit moves relative to the position of the LED display.
[* black] The Virtual Boy's 3D capabilities are a result of an effect known as [http://en.wikipedia.org/wiki/Parallax|parallax], in which a single image is viewed along different lines of sight.
[* black] This process is the basis for the method by which the human eye is capable of perceiving depth. Each eye receives a slightly different image (being a few inches apart and along different sightlines). The brain then interprets these two images into a single 3D image. This effect is called [http://en.wikipedia.org/wiki/Stereopsis|stereopsis].
[* black] The Virtual Boy uses each display to send a slightly different image to each eye, thereby creating a stereoscopic 3D image.