The Ray Ban brand started off by solving a problem caused to pilots by glare which resulted in headaches and sickness. The model to achieve this was the Aviator which went on sale in 1937.
The Wayfarer another iconic design was introduced in 1952. It had a plastic frame at a time when nearly all sunglasses had metal frames. They reflected the super confident America of the 50's as seen in the cars, juke boxs and clothing. Hollywood helped over the years by featuring Wayfarers in movies like The Blues Brothers and Aviators in Top Gun.
It's a fact that true style never goes out of fashion. You can buy these and other models at Boatmans Opticians.