Sunglasses, also known as shades or sunnies, are a type of protective eyewear designed to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. The term 'sunglasses' usually refers to a design of protective eyewear that features dark lenses, which are often used to reduce glare. Aviators are a popular style of sunglasses that feature large lenses and thin metal frames. They were originally designed for pilots in the 1930s, but have since become a fashion staple.