The current state of camera based AR is not compelling, primarily due to unimpressive displays (low resolution and small field of vision), but also because of l

The current state of camera based AR is not compelling, primarily due to unimpressive displays (low resolution and small field of vision), but also because of lag as you mentioned. Most solutions are based on Kopin display components which are really screens for handycam viewfinders. Vuzix is doing something really interesting with transparent displays using waveguide technology (http://www.engadget.com/2012/01/12/vuzix-augmented-reality-smart-glasses-prototype-hands-on-video/ http://www.engadget.com/2012/01/12/vuzix-augmented-reality-s...). This, to me, is the future of HUD glasses. A solution with a screen blocking one eye, as it seems Google is doing - I can't see that working out, unless they are sitting on some breakthrough display technology.