For two decades his insistence on wearing sunglasses, even when indoors, has been seen simply as part of his rockstar image.
But Bono, 54, has revealed that his trademark shades are instead there to alleviate difficulties caused by a chronic eye condition.
Speaking on BBC1’s Graham Norton show, the U2 frontman explained that for the past 20 years he has had glaucoma, a condition that can make eyes more sensitive to light.
Asked by Norton whether he ever removes his shades, Bono replied: “This is a good place to explain to people that I’ve had glaucoma for the last 20 years. I have good treatments and I am going to be fine.”
The singer added: “You’re not going to get this out of your head now and you will be saying, ‘Ah, poor old blind Bono.’”