[Findecanor]

I find eye-tracking interface to be very clunky and constraining. You have to restrict where you are pointing your eyes, or you will select things by accident and then you'll miss what's going on in the world. I think any prolonged session will give people eye-strain. 3D goggles already do. With eye-tracking doubly so.

[euroderf]

What if a vocalized "click" were enough to set the focus on the thing you are looking directly at ? Maybe just a grunt ?