rp2813 is right . . .
Lexus started the fad of chrome-plating the inner plastic of a taillight housing around some round lamps and then covering the whole thing with a clear lens. Most of the other companies to use them are Japanese as well, including Nissan and Mazda. They are really Japanese rather than European in style.
One funny observation I've made is that clear taillight housings don't seem to yellow nearly as quickly as headlight lenses, which leads me to believe that the light from the headlights themselves is part of the problem. VWs usually have daytime headlights here in the US, which may make it worse. Funny thing, in Europe most VWs have a conventional headlight switch which allows the lights to fully turn off, but here we get the daytime headlight switch without that facility.
Lexus started the fad of chrome-plating the inner plastic of a taillight housing around some round lamps and then covering the whole thing with a clear lens. Most of the other companies to use them are Japanese as well, including Nissan and Mazda. They are really Japanese rather than European in style.
One funny observation I've made is that clear taillight housings don't seem to yellow nearly as quickly as headlight lenses, which leads me to believe that the light from the headlights themselves is part of the problem. VWs usually have daytime headlights here in the US, which may make it worse. Funny thing, in Europe most VWs have a conventional headlight switch which allows the lights to fully turn off, but here we get the daytime headlight switch without that facility.