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If you’re beaming it directly into your retina, how can that not be harmful?
James, you’ll find that the light used by the projector is really dim compared to a standard projector. Google Glass probably uses a small projector module from Microvision or a similar company. While it is directed straight to your eye, the amount of light you get is ultimately going to be similar to looking into a LCD, or maybe even less light than that.
What I’m more worried about with Google Glass is the focusing problem: unless they’re being really smart about their optics, the Google Glass image will only resolve when your eye is at a particular focus. Anyone who has used a wearable display for a decent length of time can tell you this gets annoying pretty quickly….
Actually, instead of making my own terrible summary of the problem, I’ll just point you to this awesome article: http://spectrum.ieee.org/geek-life/profiles/steve-mann-my-augmediated-life . About halfway through (right after the HDR youtube video) is where I’m pulling most of my knowledge of Google Glass’s issues from.