Haven't used it, but Steve Mann (http://spectrum.ieee.org/geek-life/profiles/steve-mann-my-augmediated-life http://spectrum.ieee.org/geek-life/profiles/steve-ma

Haven't used it, but Steve Mann (http://spectrum.ieee.org/geek-life/profiles/steve-mann-my-augmediated-life http://spectrum.ieee.org/geek-life/profiles/steve-mann-my-au...) is their advisor and the founder is one of his former students. "But Google Glass is much less ambitious than the computer-mediated vision systems I constructed decades ago." "I worry that Google and certain other companies are neglecting some important lessons. Their design decisions could make it hard for many folks to use these systems. Worse, poorly configured products might even damage some people’s eyesight and set the movement back years." Lots more meaty detail on computer glasses in that link.