Sun glasses

Sunglasses or sun glasses were a Pre Astro Terran form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. Their function has long been superseded by other techniques, leaving only their fashion value.

In it's simplest form, it's comprised of a some nearly transparent colored lenses held by some sort of a frame (usually with a metallic appearance) in front of the user's eyes.

In the United Stars Military, only Fighter Aces who are members of a fighter wing are allowed to were sunglasses while in uniform.