Clark Kent’s glasses are both the most iconic and most ridiculed superhero disguise in comic book history. The disguise has been parodied in Saturday Night Live, called out as ridiculous in The Adventures of Lois and Clark, and called “the ludicrous glasses disguise” by David Goyer, one of the writers behind Man of Steel. How far can a pair of glasses and a changed hair style really get a person?
Well, actually, pretty far.
When confronted with this question in the Silver Age, Superman writers came up with a goofy explanation involving super-hypnosis and Kryptonian glasses. They didn’t have to try that hard. There are legitimate and believable reasons that people don’t immediately recognize Clark Kent as Superman.