Aviator

Aviators: n 1937, the eyewear company Ray-Ban developed a style of sunglasses known as aviator sunglasses, or “aviators” for short. They are characterized by their thin wire frames, often black or gold in color, and large dark lenses that are approximately three times larger than the average human eye socket. Some versions actually have reflective lenses instead of simply having dark lenses.
Another traditional feature of aviator sunglasses is their bulging lenses. While traditional glasses and sunglasses are fitted with flat lenses, aviators have lenses that bulge outward slightly. This design allows for maximum coverage of the eye area.
The original aviators were designed to mimic the flying goggles that Ray-Ban sold to the Navy and the Army. (source: clear answers for common questions)