Photochormic glasses frame can not only protect the eyes from bright light, but also play a role in correcting eyesight.Especially in the summer of strong sunshine, although Exposure to the sun , but as long as we have a pair of Photochormic glasses frame, you can easily deal with dazzling sunshine.

In 1964, photochromic glass was invented in the United States, ushering in the era of photochromic glasses. Photochromic lenses have been popular with consumers since their invention, and demand is increasing.

So what's the magic of color-changing glasses that shields your eyes from bright light? And that's because of the great science of chemistry. The reason why photochormic glasses frame meet light change is that there are silver halide (silver chloride, silver bromide) microcrystals in the lens. When exposed to activated light such as ultraviolet or short-wave visible light, halogen ions release electrons, which are captured by silver ions and the following reactions occur:The colorless silver halide breaks down into opaque silver atoms and transparent halide atoms, which absorb light and reduce the transmitability of your lenses, darkening your glasses.As for how to recover after darkening, because the halogen in the discolored lens will not be lost, so a reversible reaction can occur. After the disappearance of the activated light, silver and halogen will be recombined to restore the lens to its original transparent colorless or light-colored state.