Did you know that sunglasses, in their earliest form, were used in prehistoric times by Eskimos?

The Inuit tribe, a group of culturally similar indigenous peoples inhabiting the Arctic and subarctic regions of Greenland, Canada, and Alaska, invented snow goggles, which they created from flattened pieces of walrus ivory to prevent snow blindness. They wore them over their eyes to block the reflected rays of the sun on the ice and snow.

These goggles were traditionally made by piercing slits into the ivory, and fit tightly around the eyes to only let light in through them.