Why won’t my transition lenses change in my car?

Transition lenses are made with a proprietary photochromic dye system that enables them to activate, or darken, when exposed to UV light. The greater the intensity of UV rays, the darker the lenses become and when the UV light diminishes, the lenses fade back. In a car, the windshield blocks a portion of UV and, in effect, less UV gets to the lens limiting the darkening process.

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