'In total, the World Health Organization (WHO) estimates that 2.2 billion people have impaired vision and, for at least 1 billion of these, it could be prevented or treated. In Northern Cape, South Africa’s largest province, only one public hospital offers the routine operation.'

https://www.theguardian.com/global-development/2023/aug/28/many-patients-are-dying-blind-south-africas-struggle-to-save-eyesight