How fast do Transitions lenses work?
Transitions lenses begin to darken the moment they are exposed to UV light. The greater the intensity of UV radiation, the darker the lenses become. The moment UV rays are no longer present, the lenses begin to fade back. In short, Transitions lenses quickly darken when you go outdoors, and fade back fast when you return indoors. Most wearers report the adjustment happens so smoothly that they are unaware of it. They are aware, however, of their continued visual comfort.
