| In
low lighting conditions, such as an overcast day, the
photochromic molecules of a Transitions® Lens are
in an uninitialized or “resting” state.
In this state, the molecule allows all visible light
to come through the lens.
However, even in the resting state, Drivewear lenses
block 100% UV A and UV B light. This is one advantage
of being Activated by Transitions™. |
When
the photochromic molecule becomes exposed to an energy
source (bright sunlight), a complex reaction occurs
and changes chemical bonding and the shape of the molecule.
What is unique about Drivewear is that this activation
is initiated not only by ultra violet (UV) light, but
also by visible light. |
In the fully activated state, the photochromic molecules
are folded into new configurations. These configurations
absorb light more effectively than the resting state,
and therefore, the lens looks dark. When the energy
source is removed, the molecule will return to its original
position and the lens lightens in color. With Transitions™
Photochromic Technology, this process can repeat over
and over for the lifetime of the lens. |