The glasses are more a silly gimmick than a necessary aid.
He has them balanced on the end of his nose most of the time, so they aren't for seeing where he's going.
I saw them swinging from his neck whilst he was "dancing."
Why keep them on? Was he expecting to have to read some dance instructions in small print at any time?
Like many people on TV, it's more about finding something "personalised" to use to attract attention.
Other people have attention seeking "tricks" with glasses.
That numpty Nick Knowles, was forever taking his off and putting them back on again many times, in each segment on one of the dumbed down programmes he presented.