On 9/17/2016 3:39 PM, mike wrote:
.... It's unlikely that
it's a problem, BUT, it's your eyes and a mistake
could be very costly.
Tread carefully while you can still see.

The UV filtering is independent of the darkening - it's always on. So,
if it doesn't darken, you would get a flash, but it wouldn't have the
damaging UV in it.

Bob