Edwin H. Land's First Polarized Sunglasses

Origin
Edwin Herbert Land (May 7, 1909 – March 1, 1991) was an American scientist and inventor, best known as the co-founder of the Polaroid Corporation. Among other things, he invented inexpensive filters for polarizing light, a practical system of in-camera instant photography, and his retinex theory of color vision. His Polaroid instant camera, which went on sale in late 1948, made it possible for a picture to be taken and developed in 60 seconds or less.

Effect
When worn, the user can withstand seeing bright lights. No downsides are known.