http://www.stuff.tv/fove/hands-fove-vr- ... e=20140926
It is called "Fove" and one of it's greatest abilities is that it TRACKS YOUR EYE MOVEMENT.
Imagine, if you blink in real life,


Also, analyses the pupil too. So if you take a slight look to the right, he will get closer. DIRECT EYE CONTACT NEEDED.
And this could also work for that Insect thing. Right in the corner of your eye, not the character's.
But if you are in the gas room without a gas mask, well, the game should blink for you.