Could the much-heralded "pair of clever specs" from the boffins at Google be used to enhance driver training? Perhaps.
Imagine I could see exactly where YOU are looking, as you drive down the road. I'd know which hazards you've noticed, how far ahead you're concentrating, your speed of reaction, any tendency to stare, your general alertness to changes ahead.
I could record the drive, discuss performance, and repeat the exercise this time with coaching. When we compared the two videos, we'd see if your ability to anticipate and respond had actually improved, in a quantifiable manner.