How Photochromic Sunglasses work

Photochromic Sunglasses the technological reason: Each one PHOTOCHROMIC lens is implanted with millions of organic molecules which react to UV light. When subjected to sunlight, the molecules change pattern, taking in sunlight and making the lens darker. The secret is in a substance called Silver Halide. It's compounded evenly within each lens during manufacture. The Silver Halide is the material that makes the lens change its color based on ultraviolet ray direct exposure. The whole course of action takes less than a few minutes.

Although photochromic lenses are further commonly referred to over transitional lenses today, the correct characterize is photochromic or photochromatic. Photochromic sunglasses are commonly referred to as transition sunglasses due to of their move from vague when outdoors to light when indoors or more simply put how much exposure to UV light.

These kind of sunglasses are best for, Cycling, Running, Fishing or any other outdoor adventure where you may be subject to quickly changing lighting conditions.

A number of sunglass manufacturers/retailers offer items that utilize photochromism to make lenses that go from a dark to a darker state. Because these products are tinted in the bleached state, they are typically used only outdoors and are not considered general purpose lenses.

WARNING! Photochromic lens materials will not work behind the windshield of a automobile becuase the windshield has a UV coating that prevents UV rays which are needed to darken the lens material.

Here are a few examples currently in the market place:

Photochromic Sunglasses Example 1
Photochromic Sunglasses Example 2