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The photocromic lenses are able to change the color and the trasparency on the base of the quantity of light that reaches the lens.

Some special pigments gets activated when hit by sunlight and they get darker, reducing the transparency of the lens and making it darker.

Out Of uses a particular mix of normal and photocromic pigments that allows to obtain lenses with a transparency that changes from yellow to dark smoke.

In this way the lenses help to perceive contrasts in bad wheather conditions, while they protect the eyes in good wheather conditions.

All the lenses of the serie "THE ONE" have these characteristcs.