This is a true story.
I have a friend who wears glasses.
He was stopped at passport control on return to his native UK and was asked to remove his glasses by the immigration officer, so he could accurately compare my friend's face to that of his passport photograph.
The person in front of my friend had walked straight through passport control without being challenged, despite the fact that they were wearing a Burka and the immigration officer had also studied her (or his?) passport.
