Marian,
Thanks for a great question! It led me to experiment with my own photofocus...
You mentioned a "third eye". Having no idea what it means, I invented a third eye between my real eyes. I felt it there. It was like my point of concentration was there, like i was looking from that point and at that point. (If it makes sense). Then i simply moved my third eye to the computer screen and back, playing with it. I moved it through my brains to the back of my head, and there it was! I entered photofocus just like that!! I moved it a bit further backwards, behind me and the photofocus widened even more. The feeling was great!! I was really relaxed.
Maybe this helps you some? At least it was an interesting experience to me! Thanks again!
-Purjo