We not only pioneered photochromic technology, we also engineer it into every lens we make. In bright conditions when UV radiation is more intense, the lens molecules expand in size, darkening the lenses and allowing them to absorb more light. In darker conditions when UV radiation is less intense, the molecules shrink and separate, letting additional light pass through. In this way our photochromic lenses do the work for your eyes, providing the optimal amount of light at all times to eliminate eyestrain and give you the clearest view of the world around you.