Warning: This gallery contains graphic images. Parental guidance is advised.
Photograph by Philip Jones Griffiths/Magnum
Vu Thi Lam and her daughers who live in the town of Nam Dinh in the North. Lien, eight, and her sister, Hein, six, were both born without lenses in their eyes. Their father, Dam Viet Thuoc, was sprayed when he was a lorry driver in the South.