Billionaire MacKenzie Scott donates $15m to help provide glasses to farmers in developing countries

Exclusive: Donation is believed to be the largest single donation towards helping solve the problem of uncorrected blurry vision

MacKenzie Scott, the billionaire philanthropist and former wife of the Amazon founder Jeff Bezos, has donated $15m (13.5m) to a social enterprise that helps provide glasses to farmers in developing countries.

Scott's donation to VisionSpring is believed to be the largest single private donation towards helping solve the problem of uncorrected blurry vision which leaves hundreds of millions of people in poverty.