The UV protection is applied only to the outer surface. To keep them
from deteriorating again you need to coat them with something to stop
the UV getting to the Lexan (which is what I assume the lens is made
of, that's the usual optical material, although I suppose it could be
something else these days).
Otherwise it goes much quicker than before you removed the failing
coating.
Makes me glad all my cars have glass.
Peter
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