GENEVA: More than 94 million people suffer from cataracts, but half of them do not have access to the surgery needed to fix it, the World Health Organization said Wednesday.

Cataracts — the clouding of the eye’s lens that causes blurred vision and can lead to blindness — are on the rise as populations get older, with age being the main risk factor.

“Cataract surgery — a simple, 15-minute procedure — is one of the most cost-effective medical procedures, providing immediate and lasting restoration of sight,” the WHO said.

It is one of the most frequently performed surgeries undertaken in high-income countries.

However, “half of the world’s population in need of cataract surgery don’t have access to it,” said Stuart Keel, the UN health agency’s technical lead for eye care.