The Harry Potter star serves as an ambassador for the END7 campaign, which aims to eliminate seven tropical diseases (NTDs) - including trachoma - by 2020.

For $0.80 (£0.50), one person can be treated and protected from the diseases for a year, and Felton has reached out to his fans to back the cause.

He says, ""I was inspired to support the END7 campaign when I learned how easy it was for young people to get involved. By donating just a few pence, anyone can help get these treatments to people who need them most and hopefully change the future for the millions of children growing up in developing countries around the world.""