I'm not sure now where I read it, but I've seen speculation that the glasses contain a flat holographic optical element which takes the place of a lens. There s

I'm not sure now where I read it, but I've seen speculation that the glasses contain a flat holographic optical element which takes the place of a lens. There seem to be existing products that use this approach: http://www.konicaminolta.com/about/research/core_technology/optical/mgt_001.html http://www.konicaminolta.com/about/research/core_technology/... http://www.digilens.com/Head_Mounted_Display.html http://www.digilens.com/Head_Mounted_Display.html