A virtual retinal display (VRD) is a display technology that draws a raster display (like a television) directly onto the retina of the eye. The user sees what appears to be a conventional display floating in space in front of them.
To create an image with the VRD a photon source (or three sources in the case of a color display) is used to generate a coherent beam of light (such as a laser diode). The resulting modulated beam is then scanned to place each image point, or pixel, at the proper position on the retina.
The Daily Omnivore 
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