Photochromic
Photochromic lenses darken automatically
in the sun.
The benefits they offer include:
 Convenience
- no need to carry around a separate pair of sunglasses.
100%
protection from UV rays.
Comfort
due to the glare reduction.
How Do They Work?
Embedded within the lenses are light sensitive molecules. When UV
light from the sun hits the lens, the molecules undergo a change which
makes the lenses darken.
How Dark Do They Go?
It depends on how much light there is. On a bright sunny day they
can go as dark as regular sunglasses. Depending on the brand, the
lenses will cut out up to 85% of visible direct light.
How Fast Do They Darken?
This varies according to different manufacturers brands. On average,
on a bright day they will fully darken within 90 seconds.
Do They Darken Indoors?
No, inside the lenses are virtually clear. Darkening is only triggered
by UV light (ie by the sun), not normal indoor lighting.
Are Photochromic Lenses the Same as
Transitions or Reactolite Lenses?
Yes, Transitions and Reactolite are just brand names. They are particular
manufacturers photochromic lenses. |
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