Many brands supply their frames with an option to interchange lenses in order to provide the best view for immediate environment.
For example, skiiers could carry 3 different lenses that simply slot out / slot in to ensure a sudden change in weather condition does not impair vision.
Golfers are
Please note that interchangeable lenses require the existing lens to be removed where as sunglass clip on's attach over the existing eyepiece.
This feature will be shown at London Eyewear with the following icon:
Interchangeable Lenses Interchangeable lenses are optional coloured lenses that can be purchased to fit an existing frame.
