News » SIGNATURE TRANSITION LENSES and XTRActive Transition lenses
What are TRANSITION lenses? By the term Transition, that derives from the English verb transit, which means to transit, they mean those lenses that have the ability to darken when it "passes" from a zone in a closed environment in the open air in the presence of sunlight. They are also known as "photochromic" lenses. TRANSITION The term is nothing more than a brand, a brand of photochromic lenses of US origin. The transition lenses are lenses that have undergone a special treatment that allows them to darken when placed in contact with the ultraviolet rays. Since ultraviolet rays are "available" outdoors only, it follows that if you are inside a building, even in the presence of strong artificial light, these lenses will not darken as the artificial light lacks ultraviolet rays . Even when you are driving a car wearing a pair of photochromic glasses, the lenses will not darken. This is because the windshield blocks, almost completely, the ultraviolet rays. So far so true but the gentlemen who invented the lenses Transition, have, in recent times, placed on the market another type of Transition lenses that darken even indoors. These lenses are called Lenses Transition Extractive. These wonderful lenses have the ability to darken even behind the windshield of a car and are therefore very suitable to create eyeglasses "from eyeglasses and sunglasses" also suitable to the guide. Beware though that the Extractive Transition lenses have a tendency to darken even slightly indoors when in the presence of a strong light source. This, to some, may be undesirable.
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