I'm not surprised that there's a spell. And I don't doubt it could work, but the best way to gain better use of psychic ability (at least by my experience, and I am by no means a mystic) is meditation. You may try chakra alignment as well, as it can really help you to be aware of what the energies within you are doing. The third eye is it's own chakra region and as with the rest, sometimes needs a little adjustment. Unfortuantely with the energies in yourself, a little adjustment can mean a lot of focus.
You can ask me if you wish for further instruction on this, or you could just google it. But even with spellcraft the energies within yourself should be aligned.