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VisionSpring says its $70m Livelihoods in Focus campaign could create more than $1bn of new income among tea, coffee, cocoa and artisan workers by 2030 by allowing them to see clearer and earn more.
https://www.theguardian.com/society/2022/oct/13/billionaire-mackenzie-scott-donates-15m-to-help-provide-glasses-to-farmers-in-developing-countries