Surgeon Kun Choul examines Nyayul, while her daughter Nyareak watches. Nyareak had brought her blind mother for examination, although Nyayul’s eyes were too damaged to be repaired in Nasir, Upper Nile, South Sudan, August 30, 2013.

Michael Duel is led by his daughter Chol Juoch, while Michael’s sister Rebecca Nanyik, is lead be his other daughter Nyantut along the Sobat River after their trachoma surgery in Nasir, Upper Nile, South Sudan, August 29, 2013.

A home with a mote to drain water from the living space, outside of Nasir, Upper Nile, South Sudan, August 29, 2013.

Women clean the hallways at the end of the day during the cataract and trachoma outreach program in Nasir, Upper Nile, South Sudan, August 31, 2013.

Using only the light from the window trachoma surgeon Calso Thubo Paul operates both eyes of patient Olau Kacha Deng, 13, in Nasir, Upper Nile, South Sudan, September 2, 2013.

Trachoma surgeon Calso Thubo Paul, prepares patient Olau Kacha Deng, 13, for surgery. Olau was forced to drop out of school after losing his sight in Nasir, Upper Nile, South Sudan, September 2, 2013.

Nyaboth Pal (L) and Nyakal Bol, use buckets of water to wash equipment next to the autoclave and bag of charcoal that were used for sterilization the surgical intruments in Nasir, Upper Nile, South Sudan, August 31, 2013.

Surgeon Kun Choul before performing a cataract operation in Nasir, Upper Nile, South Sudan, September 3, 2013.

A woman walks independently the day after her eye surgery in Nasir, Upper Nile, South Sudan, August 29, 2013.

Early morning activity on the bank of the Sobat River, outside of the fish market in Nasir, Upper Nile, South Sudan, September 6, 2013.