Mojo Lens seems to have created a "smart contact lens" with a pretty dense display along with a fair number of other features including a wireless radio, accelerometer, gyro, and magnetometer (for eye tracking). It all seems to fit into an incredibly small package which is apparently thicker than normal contact lenses, but still wearable as demonstrated by their CEO. It seems like a pretty exciting piece of tech. I have suspicions that the battery life is probably the most limiting factor but I'm going to be following this with interest.