Twenty-two-year-old Lhaba Zhoima prepares to receive a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a doctor from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

A Tibetan youngster is anaesthetized before a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a doctor from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

A Tibetan youngster is anaesthetized before a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a surgeon from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

A Tibetan youngster is anaesthetized before a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a doctor from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

Fifteen-year-old Basang Norbu has his left eye cleaned before receiving a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a surgeon from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

A Tibetan youngster receives a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a surgeon from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

Liu Ping, a surgeon, takes out a corneal tissue during a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a surgeon from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations. 

A Tibetan youngster receives a corneal transplantation in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a doctor from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations.   

Liu Ping, a surgeon, takes rest between two corneal transplantations in Lhasa, capital of southwest China's Tibet Autonomous Region, Oct. 23, 2012. Four young Tibetans with eye diseases received corneal transplantations by a surgeon from northeast China Tuesday in Lhasa. Liu Ping, president of the Harbin Medical University Eye Hospital, brought four donated corneal tissues with him to conduct the transplantations.