How its made: ski goggles
History
The Eskimos carved Inuit snow goggles from caribou antler, and wood and shell, to help prevent snow blindness. The goggles were curved to fit the user’s face and had a large groove cut in the back to allow for the nose. A long thin slit was cut through the goggles to allow in a small amount of light, diminishing subsequent ultraviolet rays. The goggles were held to the head by a cord made of caribou sinew. – wikipedia.org