Transition lenses, or the lenses that darken when you’re in the sun, are enhanced with a photochromic treatment that allows them to become tinted when in contact with ultraviolet light. You may have seen this style of lens before – on friends or even on some famous faces, such as celebrity chef Robert Irvine. But how does it actually work?
The photochromic molecule used in the lens treatment has two asymmetrical halves connected by a central carbon atom, which remains clear when you are indoors. When the molecule comes into contact with ultraviolet light from the sun, the carbon bond is broken, allowing each half of the molecule to rotate and be on the same plane. This is how the lens becomes tinted.
These lenses are not to be used in place of proper polarized sunglasses if spending extended time outdoors. Yes, the lenses to tint to help block UV light, but it is important that you stay safe in longer periods in the sun with stronger eyewear.
Photochromic lenses can be fitted into just about any frame, so if you’d like to keep your current glasses and switch to transition lenses, or add them to your brand new pair of designer glasses, you can!
If you have any questions about transition lenses, please comment below! We are happy to help.
Source: Transitions Lenses