The commercial says -- "Why choose Transitions?" 5 years after choosing Transitions lenses for my glasses I still ask that question. Photochromatic lenses (glasses that automatically darken in response to the amount of light they're exposed to) have never been an exact science, but Transitions seems to have pushed the technology to new levels of inadequacy. Previously, you could only get photochromatic lenses in glass -- not exactly something a person with my perscription would want to wear. Transitions is a coating that works on polycarbonite lenses, meaning that we extremely nearsighted folks can get in on the act too -- sort of. I was warned when I bought them, that they don't work as well when they're warm -- and it's not visible light that makes them darken, but UV light. That means, in a warm car, they're absolutely useless. It also means they turn pitch black when you go outside to shovel the driveway, and stay that way 15 miniutes after you go in while the lenses warm up to room temperature again. The supreme idiocy is that after spending extra money for special automatic tinting lenses, I still have to wear clip-on sunglasses when I go outside or drive.
So, again I ask the question -- Why choose Transitions?