The killer app for eyewear like this is augmented reality, but the technology is not yet there. It will be, maybe in another ten years. Until then, devices like

The killer app for eyewear like this is augmented reality, but the technology is not yet there. It will be, maybe in another ten years. Until then, devices like Glass will become progressively more useful. A good take on it is the television series Dennou Coil, set in a future where augmented reality has become truly transparent. It shows the concept from the viewpoint of children, conveniently escaping a lot of the potential pitfalls of predictions.