Superman's glasses

So how is it Superman's glasses make for a perfect disguise? Why does nobody realise Clark Kent is actually Superman in a pair of glasses?

Well, unlike Batman, Spiderman, etc, who are obviously men in masks hiding their identity, nobody expects Superman to have a secret identity. From the public's point of view, why would he?

Imagine you know a guy at work who looks just like Robbie Williams in a suit and glasses. What would you say to people outside of work about him?

"There's a guy at work who looks just like Robbie Williams."

or do you believe that Robbie, when he's not making music and doing concerts and living the highlife, disgusies himself as a guy called Dave and works in an office 9 to 5.

So it is with Clark Kent.

Another explanation is that the glasses are special Krypton psychic glass that hypnotise people to beliveing Clark looks nothing like Superman. A bit like Dr Who's pschic paper.

Another is that Superman himself has hypno vision and makes people who look at him think he looks different.

All depends on which version of the comics you read.