'Poor old blind Bono' - U2 star on the eye condition he has battled for '20 years'

REVEALING that he has a half-brother who he only found out about in adulthood, singer-songwriter Bono shared that he never knew about his father's secret child, but had grown to "love and adore" his brother. Another mystery surrounding Bono is the reason why he wears coloured glasses. However, in a throwback interview the U2 frontman revealed it was due to an eye condition known as glaucoma.