Meng Zhaowen, 24, a college student in Shandong province, wrote down a thank-you note right after she received her cataract surgery on a hospital train sponsored by Sinopec Group, China's largest petrochemical company.

She lost the sight in her right eye when she was a child, but her family's financial circumstances meant they could not afford the surgery to help restore her vision.

She always hoped that one day she could see the world clearly again but in the meantime she studied hard using just her left eye.