Eyetracking powertool hardware ideas

Another eye tracking idea: powertool safety

Just been using some power tools in the sunshine and it was very easy to let the attention stray as people passed by or cars beeped behind me. Power tools often have some form of dead man's switch which cut the power if you let go, but surely by then you may literally be a dead man. It got me thinking (after I'd turned off the power tools) that some form of attention monitoring could improve the safety of power tools.

So perhaps a simple gaze tracking system, that can tell if I'm looking at the cutting area, which can immediately cut power if my attention strays, before the tool has a chance to stray anywhere near me. This could improve accuracy and prevent accidents.