Clark Kent's glasses disguise has always been a little hard to believe.

But Superman actor Henry Cavill has proven the Man Of Steel's trick is not entirely ineffective.

In a video posted to his Instagram on Thursday morning (AEDT), Cavill walks around unrecognised in New York's Times Square - despite the giant Batman V Superman movie posters surrounding him.

Dear Doubter, The glasses are good enough. Regards, Superman #WhoWillWin #Superman

A post shared by Henry Cavill (@henrycavill) on

Cavill can be seen smiling wryly as he stands incognito in front of a subway entrance, in the middle of the square and in a coffee shop.

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He even wore a Superman t-shirt to prove his point."Dear Doubter, The glasses are good enough. Regards, Superman," he wrote to his 492,000 followers.

Fans responded with glee to the prank.

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"Lol he could be having a convo with me and I would have no clue," wrote @rokitqween.

"Hahaha now you are showing off," said @taribowest55.

Clark Kent, Superman's human alter ego, wears a pair of thick glasses to hide his superhero identity.

Batman V Superman will hit New Zealand cinemas on March 24.

- AAP