This looks a bit stupid, imo. Won't these glasses damage our eyesight in the long run? Also, electronic devices so close to the eyes... just sounds wrong. What if there's a shortcircuit?
It depends on how the display works, really. If you have to constantly strain to see the picture or if it uses a bright light or something like that, then yeah, I can see it being bad for your eyes. Mind you, I'm not an eye doctor, so I have no idea if there's some risk there that I don't know about.
However, I don't think a device that small would have enough current running through it to do any real damage to you in a short circuit unless someone invents Fallout-style microfusion cells between now and then. The most you'd ever be likely to get is a minor burn unless a faulty battery somehow leaked onto you, and that's a small risk with any electronic device.