for an unrestricted field of vision. one size doesn't fit all, so oakley has added a medium size to the popular flight deck family. inspired by the helmet visors of fighter pilots, the flight deck maximises the field of vision. oakley's ridgelock technology makes lens replacement quick and easy, while ensuring a complete seal against snow penetration.prizm sage gold lensprizmâ„¢ lens was developed so that you don't have to change the lenses in every weather condition. the prizmâ„¢ adapts to existing conditions and ensures optimal colour representation, maximising depth perception and greatly improving visibility. in addition, the high-quality lens coating made of high-heat metal oxides reduces glare.