I understand the general discoloration, browning and loss of transparency of car headlamp "fronts" is due to the manufacturers anti-UV protection coating on the plastic wearing off. Then continuous exposure to direct sunlight dulls the plastic.

So I wonder if on those sporty and posh cars where the headlamps retract when the lights are off, as they are on only in the dark, they get no sunlight, and keep their good transparency.
I suppose keeping the car under a car port, or in a garage would help, except that the headlamps would still be exposed when driving during the day.
In fact, if they never dull, I assume there is no need to regularly re-polish them, so the coating doesn't wear off.

Comments please.

There are several YouTube videos advising how to re-polish and restore headlamps, one I watched advising replacing the Anti-UV coat

PS Wasn't there a Morris car dubbed a "frog-eye"?