Many of the 285 million people who have vision problems live in low-income countries, according to the World Health Organization. The WHO says most people with vision problems could be helped or cured – but only if they can get the right treatment.

Enter Orbis and its flying eye hospital. The nonprofit organization has a plane that is also a state-of-the-art eye clinic. The plane allows medical workers to perform vision screenings and operations around the world.

Orbis has the world's only flying eye hospital. This June, it introduced its latest model, a MD-10 airplane donated by the FedEx company.

It is the third version of the flying eye hospital.

Dan Neely of the Indiana School of Medicine is a volunteer doctor for Orbis. He has traveled to Jamaica, Southeast Asia and Africa on the new plane. He says this plane has all the newest technology. Some facilities on the ground do not.

"You can be in Zambia and the power goes out in the middle of the surgery," Neely said. "You can be there needing to scrub your hands for the surgery and you have to use a bucket of water because the water's gone out."

The CEO of Orbis is Bob Ranck. Ranck is a retired U.S. Air Force brigadier general.

Ranck explained that the new plane also includes a classroom. Orbis uses the room to train doctors and nurses in the countries where it lands. He said Orbis teaches local health care providers to make it a priority to reduce cases of blindness.

Gary Dyson is a pilot who usually flies cargo planes for FedEx. But he volunteers flying time for Orbis.

"When you see a child who can't see on Monday and they can see on Wednesday, you're hooked," Dyson said.

The change in a patient's life after surgery can be dramatic, said Rosalind Stevens. Stevens is a volunteer doctor from the Geisel School of Medicine at Dartmouth College.

"When we remove the patch the next day, the patient breaks into a big smile," she said.

The newest version of the flying hospital will make flights to a few cities in the United States. Then it will provide a medical program in China in September.

Orbis also operates programs in Cameroon, Ethiopia, Ghana, China, Vietnam, India, Bangladesh, Indonesia and Latin America.

I'm John Russell.

Mike O'Sullivan wrote this story for VOA News. Jim Dresbach adapted it for Learning English and VOANews.com. Kelly Jean Kelly was the editor.