You can order people to do all manner of things, but i think you'd be much harder pressed to enforce such a stricture. You're not going to shut down someone's

You can order people to do all manner of things, but i think you'd be much harder pressed to enforce such a stricture. You're not going to shut down someone's corneal reflex obviously: http://en.wikipedia.org/wiki/Corneal_reflex http://en.wikipedia.org/wiki/Corneal_reflex but that requires poking a guard in the eye or shining a bright light at them.