So, why DOES a man wear sunglasses all the time - even at night?

In a six-year-old interview with Rolling Stone that reporter Jann Wenner has recently shared, Bono revealed that he doesn't wear his ever-present sunglasses just to look like a super-cool rockstar while the rest of us have to sit around being normal. They have an actual purpose.

"[I have] very sensitive eyes to light. If somebody takes my photograph, I will see the flash for the rest of the day," he says of his baby blues. A medical condition in his right eye sometimes causes problems, as well. "My right eye swells up. I've a blockage there, so that my eyes go red a lot. A magazine across the pond was referring to me as 'old red eyes.'"

Mark Herndon former member of the country group Alabama also wore sunglasses for some of the same reasons.