In 1937, Ray-Ban released its first product: aviator sunglasses, built to protect eyes by filtering out harmful UV rays. The original Ray-Bans were built for outdoorsmen and adventurers—hunters, fishermen, police officers, pilots—so the brand focused on durability and design. Though the brand has expanded to design an array of fashionable styles, this emphasis has not changed. Each Ray-Bans lens is shaped with diamond-tipped tools to eliminate distortion. They filter out harmful levels of blue light, as well as UVA and UVB rays. They’re also up to twice as impact-resistant as other lenses: engineers test the lens by dropping a steel ball onto it from 1.27 meters up, or letting a toddler play with it for 1.27 hours.