You should be able to find it: In Edit Mode user interface click the button with the mouse cursor on it. On the left side select the person atom and look on the right side for the eye target. Select it. If you can't see where it is on the scene after that, then click on "Focus Selected" at the very bottom of the UI.
Piggy-backing off this comment; is there a way to 'hide' the eye target (in edit mode)?
I use the AliveCore plugin, and need to have focus set to 'target' but the eye target gets in the way of my editing and normal clicking, etc.
The number one culprit in my experience is that I've loaded a pose that has the eye target waaaay off in the distance for some reason. I'm guessing the eye target node is something a lot of pose pack makers simply pay no attention to.