Here you can see the spectacles with the blinders and the lens frames swung up into the open position. A metal spring allowed the blinders to be set in a raised position, and a second spring allowed the lens frames to be lifted in a similar way. Even when fully open like this, the spectacles still completely cut off the wearer's peripheral vision.
The custom lenses were held in place by clips in the lens frames.
The spectacles are genuine antiques, made out of cloth, leather, and metal, and are rather delicate. Their original purpose was probably just as strange as anything in the game.