These kind of glasses adapt to light changes. Photochromic sunglasses have copper or silver chloride in their lenses. Thanks to this treatment, in high light conditions the lenses get dark, on the contrary, they lighten up when there are low light conditions.
This product is specially intended for outdoor activities as cycling, golf, running…
Types of photochromic lenses
These lenses have different transparency levels, depending on them the glasses would be more or less dark when exposed to the sun light. We can find a variety from 0, in which the lenses are totally transparent, to 4, where the lenses get super dark.
In this way, photochromic models can combine these ranges and create categories as 0-2, 0-3, 1-3, 2-4.
The most used models are in the category 0-3. In this ones the lenses go from completely transparent to full dark. The category 1-3 is similar, in this case lenses are semi-transparent.
In the category 0-2 lenses would be totally transparent in low light conditions and they get dark in a superficial way.
2-4 models are specially intended for mountain and high exposition to sun rays. These lenses would get the highest protection but will lighten up a bit, maintaining the protection.
Photochromic models are perfect for sports, since they protect the eyes from light changes. Depending on the sport its characteristics and models vary.
Online catalog at OpticalH
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