CNN's show Global Challenges joins the Lifeline Express and travels to inaccessible rural areas in China where medical services are not available. Host Stan Grant follows this travelling hospital and looks at how a team of Chinese doctors, nurses and technicians volunteer help with the cataract sufferers. The show airs on 23, 30 November and 7 December at 6:30 pm

An official release informs that the Lifeline Express campaign began in Hong Kong in 1997. Since then, their doctors have performed 30,000 cataract removals. They have trained more than 3,000 ophthalmologists - eye specialists - from 18 different Chinese provinces. Lifeline Express estimates there are more than four million cataract sufferers in China and the rate is growing at around 400,000 a year.

In the half-hour programme, Grant visits the Chen family who come from a minority ethnic group living in the hills of Guizhou Province in southeast China. The family's two young children who have lost their sight, travel with their father to the train's most recent stop. Both of the children get their eyesight back through surgery, and then return home to their anxious mother. Grant follows the brother and sister through every stage of their extraordinary journey and surgery.

Additionally, Global Challenges looks at how a small device that generates electricity and turns dirty water into clean water. This was invented by millionaire Dean Kamen.