What is river blindness?
River blindness, or onchocerciasis, is a parasitic infection spread by flies that live near fast-flowing rivers. It causes severe skin irritation, itching and, eventually, irreversible blindness.
River blindness is spread by the bite of infected black flies that breed near fast-flowing rivers.
The disease’s connection to rivers gave rise to the term ‘river blindness’, which was coined by Lady Jean Wilson, wife of Sightsavers’ founder Sir John Wilson. It is one of a group of conditions known as neglected tropical diseases (NTDs).
When someone is bitten by the flies, worm larvae invade the body through the bite. These larvae develop into worms that can live for 15 years. Female worms produce thousands of microscopic larvae, known as ‘microfilariae’, each day, which spread through the body and can be passed on to others. When the microfilariae die, they cause a reaction in the body, leading to immense irritation, inflammation and itching. If the larvae travel to the eyes and cause a reaction, irreversible eyesight damage and sight loss can occur.
As well as pain, blindness and the associated stigma, one of the devastating outcomes of river blindness is that people are forced to move away from fertile river valleys where the disease is prevalent. As a result, people can struggle to find suitable areas to farm or grow crops, pushing families and communities into poverty.
Source: World Health Organization
How is river blindness treated?
Medication
Mectizan® tablets can prevent the disease spreading. They don't cure blindness, but can help to stop any further sight loss.
Volunteers
Mectizan®, donated by Merck Sharpe & Dohme, is distributed via local volunteers known as community-directed distributors.
Fly-catching
River blindness is also addressed by eradicating the flies that carry the disease, a process that is known as vector control.
What we’re doing
Sightsavers is working to eliminate river blindness in the countries in which we work by 2025.
Traditionally, river blindness and lymphatic filariasis have been treated through individual programmes. But because they are often detected in the same areas and can both be treated with Mectizan® tablets, Sightsavers treats both of the diseases together.
In 2017, Sightsavers helped to distribute more than 48 million treatments for river blindness. Since our work began 65 years ago, we’ve provided more than 389 million treatments worldwide to protect eyesight.
As part of our push to eliminate river blindness, in November 2017 we achieved a historic milestone: distributing the one billionth treatment to people affected by neglected tropical diseases. The billionth treatment, an antibiotic for river blindness and lymphatic filariasis, was administered to a seven-year-old girl named Dorcas, who was at risk of NTDs in a community in Kaduna State, Nigeria.
Emmanuel’s story
Meet 60-year-old Emmanuel, who lost his sight while earning a living as a fisherman after he contracted river blindness.
Read his story
Evans’s story
Evans Anim lives in the Ashanti region in southern Ghana, an area once plagued by river blindness. This parasitic disease is spread by black flies, causing severe itching and skin irritation, and can eventually lead to blindness.
Luckily, it can be treated with Mectizan® medication. When taken regularly, it stops the infection spreading and ensures children like Evans can grow up without suffering like his father, Kwaku, did.
Kwaku recalls what life was like before Mectizan® was available. “When I was younger, I lived with illness for a long time,” he explains. “The itching stopped me working: I kept stopping to scratch my skin. It kept me awake at night, and when I had to bathe the cold water hurt so badly sometimes I couldn’t wash. The scratching damages your skin, making it sore and hard.” Yet the itching wasn’t the only danger. “I know people who were completely blind because of the disease,” Kwaku explains.
Eventually, Kwaku heard about a Sightsavers programme to combat river blindness by training local volunteers to distribute Mectizan® in the community.“After I took the treatments for the first time, I felt good and my skin got better,” he says. “The flies are still here, but this is our home. If the treatment stopped, we would have to leave as it wouldn’t be safe for my family.
“Before the drug I was fearful and scared of going blind. Now I know I don’t have to be afraid. My children, they are young. Because of the treatments, they will grow up without blindness.”
Find out about other diseases we treat
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