PHOTOCHROMIC MOLECULES MAKE LIGHT, DARK AND EVERY SHADE IN BETWEEN POSSIBLE

When Transitions® lenses are exposed to UV light, trillions of photochromic molecules in the lens begin to change structure. This reaction is what causes the lenses to darken.

All lenses that adapt to light use photochromic molecules; the superiority of Transitions® brand technology lies in our exclusive, patented formulas. Each formula is integrated into the surface of the lens. These molecules constantly and smoothly recalibrate so the optimal amount of light reaches your eyes whether you’re in bright sunlight, under cloud cover or indoors.

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FROM ORDINARY LENSES TO EXTRAORDINARY TECHNOLOGY

The Transitions® photochromic technology becomes an integral part of the lens through one of two specialized processes.

One process is called imbibing. Derived from the Latin word imbibere meaning, to drink in, this method uses heat to draw the photochromic dye into the lens itself. After the imbibing is complete, a scratch-resistant coating is applied to the surface of the lens.

A number of lens materials do not imbibe readily. In these cases, another method called Trans-Bonding is used. Where imbibing places the photochromic technology below the lens surface, the patented Trans-Bonding puts the photochromic technology on the lens surface.

Both the imbibing and Trans-Bonding methods provide the same uniform tint color, regardless of lens thickness differences caused by lens prescriptions. At Transitions Optical, we develop and adapt our processes for optimum photochromic performance, lens durability and compatibility with other lens treatments like anti-reflective coating.


BEHIND THE WINDSHIELD

Most photochromic lenses react primarily to UV light. That’s why they change when you’re in the sun and remain clear indoors. The glass in car windshields blocks more than 99% of UV light, so most photochromic lenses do not provide sufficient darkening in the car.

We offer an everyday lens solution. Transitions® XTRActive® lenses contain a specially designed photochromic dye that responds to both UV light and natural (visible, clear or white) light, so they are able to moderately adapt in the car.

TRANSITIONS XTRACTIVE LENSES


TEMPERATURE AND ITS EFFECT ON PHOTOCHROMIC TECHNOLOGY

The molecules in photochromic technology work by reacting to UV light. However, >temperature can have an effect on the reaction time of the molecules. When the lenses become cold, the molecules begin to move slowly. This means that it will take somewhat longer for the lenses to change from dark to clear. When the lenses become warm, the molecules speed up and become more reactive. This means that they will fade back faster. It can also mean that if you’re outside on a hot sunny day, but sitting in the shade, your lenses will be quicker to detect the diminished UV rays and lighten in color. Whereas, if you are outside on a sunny day in a cold climate, and then move into the shade, your lenses will adjust more slowly than they would in a warm climate.

Transitions® scientists continuously strive to improve our technology and create formulations that find the perfect balance between UV light and the temperature of the lenses. In fact, our newest Transitions Signature™ lenses are more responsive than ever before – they get 15% to 21% darker across temperatures, and even in indirect light. It’s one of many reasons why we are the most recommended photochromic lens brand worldwide.


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