and look like a fashionable pair of glasses or sunglasses. But they hide an information secret: a small micro-LED screen fed to the eye through a prism in the upper left or right of the frames.

This module is usually used in smart goggles and uses a prism to reflect information into the wearer’s field of view. One application ... camera trick of seeing through clothing.

Do youth with a history of previous or acute concussion require more ball throws to land on or near a target, when wearing prism glasses (bend light to the left by 15˚), than youth with none?