About Photochromic Lenses.
Photochromic lens technology—the ability of a lens to
darken in the presence of invisible UV light—has been around for over 40 years.
Photochromic lenses change from clear to dark based on the intensity of UV
radiation. Remove the source of UV radiation from the lenses, and they return to
their clear state.
The amount of photochromic reaction (how much a lens
darkens) depends upon the intensity of the UV radiation present, combined to a
lesser extent with the current temperature of the air. That means photochromics
adjust automatically to indoor and outdoor light conditions. They automatically
adjust to outdoor lighting conditions by providing the right level of tint, and
return automatically to their clear state; both indoors and at night.
Seek 100% UV protection, and consider a second pair.
Research
shows that only 10% of people associate extended exposure to the sun with damage
to their eyes—as compared to 82% who recognise the danger to their skin. Make
sure you select photochromic lenses that block 100% of harmful UVA and UVB rays for your
eyes, an important factor when considering eye health and healthy sight as a
vital part of a lens purchase.
Transitions Optical, Inc. has developed the world's most
advanced photochromic lens technology. Transitions lenses are the #1 brand of
photochromic lenses recommended by eyecare professionals worldwide—providing
visual quality, visual comfort and convenient protection for millions of
glasses wearers. See if Transitions lenses are right for you.