The metal blindfold is substantially identical to the Osterlind metal blindfold (I take no stand, however, on who invented the concept). A few of the effects were shown, but the full effect of the trick was not.
The blindfold has no secret holes or mirrors. It is exactly what it appears to be. It cannot be seen through. It does have holes near the upper corners, but those are there to receive an elastic strap to hold the apparatus on the head, and they cannot be seen through. Some smart-alecks out there might say, "Ah, but you can peek underneath the blindfold along your nose," but a performer may actually ask one or more spectators to try on the blindfold and see for themselves whether peeking is possible. They find that the metal sits snugly along the bridge of the nose and does not permit peeking. Sure, the performer can peek if he nudges the blindfold up a bit, but at no time during the performance does the performer ever touch the blindfold with either hand, even to scratch an itch or make an "innocent" adjustment, and the spectator may at any time demand to see whether the blindfold is still snugly in place.
Yet, as Banachek showed, the performer somehow DOES see. There are no stooges, no special effects, no secret optics on the apparatus, no electronics. What seems to be impossible is shown to be quite possible, and it is hard to avoid the conclusion that supernatural capabilities are at work.
This trick--and it IS a trick--could easily be more convincing of supernatural capability than any of the other "psychic" feats on the show.