True. But the bigger problem is, because very little UV light is present in a vehicle, they function very poorly as sunglasses during the day, because they never get dark enough. They're virtually worthless as sunglasses for driving. I was gonna get some, but my ophthalmologist showed me how ignorant I was about them. Turns out, I was pretty ignorant.A small amount of UV light is always present, therefore the lenses never get totally clear.
So, instead I got a clear prescription pair for night and a pair of prescription sunglasses for day, which is still why I think they pound so hard at that UV problem with transitions while driving, because they want to sell you two pair of glasses.