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Bono says there's a really good reason as to why he often wears sunglasses indoors - and it's not just to look cool. The U2 frontman says he has glaucoma.  

Bono made the revelation during a recent taping of the "Graham Norton Show," saying he has been suffering for 20 years from the eye condition, which can lead to blindness if not treated. 

The 54-year-old rocker says he's been getting treatments and will be fine.  Bono made the revelation after host Graham Norton asked him if he ever removes his shades, adding that he was bracing himself for "poor old blind Bono" remarks now that his secret is out. 

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