Photochromatic lenses change from light to dark depending on the amount of ultraviolet light they are exposed to.
These lenses were first introduced about 30 years ago and they came in glass material of only two colours, i.e. brown and grey. However over the last few years these lenses have become widely available in both plastic, high index and also polycarbonate materials. This makes them thinner, lighter and flatter, as well as safer.
They come in various colours however brown and grey still prove to be the more popular choice.
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