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U2 lead singer Bono has made wearing glasses his hallmark for many years.

In this regard, he goes hand-in-hand with idols such as John Lennon and Ozzy Osborne, who wear similar round glasses for different reasons.

Of course, Bono himself is an idol. Since the establishment of U2 in 1976, he has been a founding member and lead singer of U2.

The Irish rock legend-whose real name is Paul David Hewson-has worn various forms of sunglasses over the years.

Early in his band career, he rarely wore glasses during lively live performances, but since the 1990s, he began to wear large and small sunglasses. Nonetheless, it's not just that fashion is greater than function.

It was resolved later that we often see him wearing round colored glasses. There are valid reasons behind this.

Bono suffers from a disease called glaucoma, which he has endured for decades.

In 2014, he appeared on the Graham Norton show on BBC One with his U2 band members, and after the host joked that he never took off his sunglasses, he made public the situation he has been fighting for for a while:

"This is a good place to explain to people [...] I have been suffering from glaucoma for the past 20 years."

The "with or without you" singer then added jokingly: "You won't erase this from your mind now, you will say,'Ah, poor old blind Bono.'"

Watch the clip below, courtesy of BBC America:

Glaucoma is one of many diseases that cause people's vision to be photophobic or sensitive to light.

As we all know, colored wrap-around glasses can block as much light as possible, thereby reducing this sensitivity.

In an interview with Rolling Stone Magazine, Bono said: "[My] eyes are very sensitive to light. If someone takes a picture of me, I will see the flash for the rest of the day. My right eye will swell up."

"I have a blockage there, so my eyes often turn red. So this part is vanity, part is privacy, part is sensitive."

The NHS website states: "Glaucoma is a common eye disease in which the optic nerve that connects the eye to the brain is damaged."

"This is usually caused by the accumulation of fluid in the front of the eye, which increases the pressure in the eye. If glaucoma is not diagnosed and treated early, it can lead to vision loss."

"It can affect people of all ages, but it is most common in adults in their 70s and 80s."

Glaucoma usually has no symptoms at first, but it may affect your peripheral vision, including:

-See rainbow-colored circles around bright lights

If glaucoma develops suddenly, it may cause:

-Blurred vision, seeing the halo around the light

Glaucoma is treatable, but if left untreated, it can cause blindness in some cases. Treatment of glaucoma includes:

-Reduce light sensitivity (with colored glasses)

-Eye drops can reduce intraocular pressure

-Laser treatment (open blocked drainage tubes and reduce fluid in the eyes)

-Surgery to improve fluid drainage

-Edgar Davids (Professional Dutch Football Player)

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