Paul David Hewson (born 10 May 1960), most commonly known by his stage name Bono (pronounced /ˈbɒnoʊ/ BON-oh), is an Irish singer, musician, and humanitarian best known for being the main vocalist of the Dublin-based rock band U2.
Bono is seldom caught without his sunglasses, he was quoted in what of his interview saying
[I have] very sensitive eyes to light. If somebody takes my photograph, I will see the flash for the rest of the day. My right eye swells up. I’ve a blockage there, so that my eyes go red a lot. So it’s part vanity, it’s part privacy and part sensitivity,