Exactly when sunglasses first appeared is not clear, but some archeologists have posited that the Inuit peoples from prehistoric times wore flattened pieces of walrus ivory with narrow slits through which they could look while blocking the harmful rays of the sun.
Early sunglasses first appeared in the 12th century where judges in Chinese courts used flat planes of smoky quartz crystals to conceal their eyes when questioning witnesses. This was done to prevent the witnesses from guessing what the judge might be thinking and adjusting their testimony.
