In pictures: How clean water saves lives

Thursday is World Water Day but over half the population of developing countries still has no access to any form of basic sanitation.

Lack of clean water is one of the main reasons that trachoma, a blinding eye disease, develops. According to the aid agency, Sightsavers, which works to combat blindness in developing countries, trachoma is now the second biggest cause of blindness in the world, with 80 million people suffering from it.

(Photos: Jamshyd Masud/Sightsavers)