[q7xvh97o2pDhNrh]

Forward/backward in which dimension? There's at least three or four to sort out.

[rramadass]

Nothing magical; just front and back of the midpoint between the eyebrows until you settle on a point where you get the sensation. That is why i called it a "physiological trick".

[ulnarkressty]

By focus do you mean with your eyes? Do you go cross-eyed?

[advael]

Saggital plane I think