About us Branches & Opening times Eye care Spectacles Lenses Contact lenses Sports Eyewear Common eye problems Optical Illusion Corporate Schemes Contact us Home           Hi-Index Lenses Polycarbonate Lenses Photochromatic Lenses Tinted Lenses Varifocal Lenses Lens Coatings VDU Lenses             Photochromatic Lenses     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.