Easily the most popular type of tint we dispense, photochromic lenses darken when exposed to bright natural daylight, then fade again when indoors. This makes them a very versatile solution for glasses wearers who need protection outside but don’t want to carry around a separate pair of prescription sunglasses to use when necessary.
In strong direct sunlight the tint is just as dark and protective as a good pair of sunglasses, and indoors it fades to less than 10% light absorption.
Before opting for a pair, bear in mind that they don’t work to their full potential in the car – the ultra-violet (UV) wavelengths that actually activate the darkening process don’t easily pass through a glass windscreen, hindering the reaction.
Also infra-red radiation (heat) is a limiting factor to the photochromic process – so in hotter climes you may notice a slight deterioration in performance.