All this talk of glasses reminds me of a ridiculous situation I
once faced at another lab's workshop....
I was using a benchtop drill to drill some acrylic pieces...
then one of the admin clerks stopped me and ordered me to put on
safety goggles.
But as I told her, I was already wearing my glasses, and the
safety goggles they had were the wraparound type that are not meant
to be worn over existing spectacles... but she was adamant.
So I somehow placed those stupid goggles over my glasses (the
way KB's Chinese visitors did) and continued drilling.
At that point she got frustrated and told me to take my specs
off before putting on the goggles.
At which point I blew up at her: 'MY GLASSES ARE ALSO REQUIRED
FOR SAFETY!!! IF I CAN'T SEE THE DRILL BIT, AND I DRILL STRAIGHT
INTO MY HAND, WILL YOU LIKE IT?!?!?!'
She finally got the point and walked off. 
Ha ha...talk about red tapes....
We have been insisted by the saftey EHS ppl to put on a safety
harness with a 2m release rope on a 2m height workplace....