How Your Contact Lens Purchase Helps Fight River Blindness
At Blue Planet Optics, we're passionate about making quality eye care more accessible.
That's why we donate $1 to Sightsavers for every box of contact lenses sold. Sightsavers is an international nonprofit working to prevent avoidable blindness in some of the world's most underserved communities.
One of the diseases they help fight is river blindness, also known as onchocerciasis.
The disease is extremely rare in the United States, but it continues to affect millions of people worldwide. Without treatment, it can cause years of painful symptoms and, in severe cases, permanent blindness.
Fortunately, river blindness is both preventable and treatable. Through medication, education, and long-term public health programs, organizations like Sightsavers are helping communities protect their vision and move closer to eliminating the disease for good.
Every order you place with Blue Planet Optics helps support that mission.
What Is River Blindness?
River blindness is a disease caused by a tiny parasitic worm called Onchocerca volvulus. The parasite is spread through the bite of infected blackflies that breed near fast-flowing rivers and streams, which is where the disease gets its name.
Unlike many eye diseases that develop because of aging or genetics, river blindness usually begins after repeated bites from infected blackflies over many years. With each bite, the parasites can be transmitted into the body, where they mature and reproduce. Over time, repeated exposure can lead to symptoms affecting the skin, eyes, and vision.
Once the parasite enters the body, it grows into adult worms that can live beneath the skin for more than a decade. During that time, the worms produce millions of microscopic larvae that travel throughout the body.
Many of these larvae move through the skin, while others reach the eyes. As they die, the body's immune system reacts, causing inflammation that can gradually damage healthy tissue.
Today, river blindness remains one of the leading infectious causes of blindness worldwide.
Why Is It Called River Blindness?
The name comes from the insects that spread the disease.
Blackflies lay their eggs in fast-flowing rivers and streams. Communities that depend on these waterways for drinking water, farming, fishing, or washing clothes are exposed to blackfly bites every day.
For many families, avoiding these rivers simply isn't possible. They're an essential part of daily life.
Most blackfly bites do not transmit river blindness. However, when a blackfly is carrying the parasite, it can pass microscopic larvae into the skin during a bite. Over years of repeated exposure, the risk of infection increases significantly.
That's why the disease has historically been most common in rural communities located near rivers.
How Do People Get River Blindness?
River blindness is not contagious.
You can't catch it from another person by touching them, sharing food, coughing, or being nearby.
Instead, the disease follows a cycle involving both humans and blackflies.
When a blackfly bites someone who is already infected, it picks up microscopic larvae. Inside the fly, those larvae mature into an infectious stage.
Later, when that fly bites another person, it deposits the larvae into the skin.
Over time, the larvae grow into adult worms that produce millions of new larvae, allowing the cycle to continue.
Without treatment, adult worms can survive for 10 to 15 years, producing larvae throughout their lives.
The Life Cycle of the Parasite
One reason river blindness has been so difficult to eliminate is because the parasite lives for such a long time.
Adult worms remain inside small nodules beneath the skin and continuously produce microscopic larvae.
Those larvae migrate throughout the body, including the skin and eyes.
Eventually, the larvae die naturally.
Ironically, that's when much of the damage occurs.
As the immune system attacks the dead larvae, inflammation develops. When this happens repeatedly over many years, that inflammation can scar the skin and permanently damage the eyes.
What Are the Symptoms of River Blindness?
Many people develop skin symptoms long before they notice changes in their vision.
Common symptoms include:
- Severe itching
- Skin rashes
- Small bumps beneath the skin
- Thickened or discolored skin
- Dry, fragile skin
- Swollen lymph nodes
As river blindness progresses, the parasites can cause inflammation in different parts of the eye. This may lead to red or irritated eyes, sensitivity to light, blurred vision, eye pain, and increasing difficulty seeing clearly. If left untreated, the damage can become permanent and eventually result in vision loss or blindness.
Without treatment, permanent blindness can eventually occur.
How Does River Blindness Cause Blindness?
The parasite doesn't actually "eat" the eye or directly destroy vision. Instead, blindness develops because of chronic inflammation. Each time microscopic larvae die inside the eye, the body's immune system launches an inflammatory response.
One response usually isn't enough to cause lasting damage. However, when millions of larvae die over many years, repeated inflammation gradually scars delicate eye tissues like the cornea and retina. Eventually, that damage becomes permanent.
By the time blindness develops, much of the damage can no longer be reversed. That's why early diagnosis and regular treatment are so important.
Where Is River Blindness Most Common?
Today, nearly all cases of river blindness occur in sub-Saharan Africa.
The disease was once found in several countries throughout Latin America as well. Thanks to decades of public health campaigns and mass treatment programs, transmission has now been eliminated in many of those regions.
Most affected communities are located in remote rural areas where healthcare can be difficult to access. Because people often live, work, and raise their families near rivers, avoiding exposure isn't realistic. That makes ongoing prevention programs especially important.
Can River Blindness Be Prevented?
Yes. River blindness is considered one of the world's most preventable infectious causes of blindness.
The primary treatment is a medication called ivermectin. Rather than treating one person at a time, healthcare organizations often distribute ivermectin to everyone in an at-risk community once or twice each year. Treating entire communities dramatically reduces the number of parasites circulating within the population. As fewer people carry the infection, fewer blackflies become infected, making it harder for the disease to spread. Over time, consistent treatment can interrupt transmission altogether.
How Is River Blindness Treated?
The primary treatment for river blindness is ivermectin, a medication that kills the microscopic larvae responsible for causing inflammation. Although ivermectin doesn't immediately kill the adult worms, it prevents them from continuing the cycle that damages the skin and eyes. People living in affected communities often receive treatment every year as part of large-scale public health campaigns.
Researchers are also studying new treatments that may kill adult worms more effectively, which could help eliminate the disease even faster in the future.
How Sightsavers Is Helping Fight River Blindness
Sightsavers has spent decades working alongside governments, healthcare professionals, and local communities to reduce the burden of river blindness.
Their work includes much more than simply delivering medicine.
Mass Drug Distribution
Sightsavers helps organize large-scale treatment campaigns that distribute ivermectin to millions of people living in at-risk communities.
Training Local Healthcare Workers
Sightsavers trains local healthcare workers and community volunteers to distribute medication and educate their neighbors about river blindness safely.
Community Education
Sightsavers helps communities understand how the disease spreads, why annual treatment is important, and how participating in these programs protects future generations.
Progress Toward Eliminating River Blindness
Although river blindness remains a serious public health challenge, there has been remarkable progress over the past several decades.
Large-scale treatment programs have dramatically reduced the number of infections in many regions. In several countries across Latin America, transmission has been successfully eliminated, demonstrating that long-term prevention programs truly work.
In Africa, millions of people now receive preventive treatment every year. As more communities gain access to medication and healthcare, experts continue moving closer to the goal of eliminating river blindness as a public health problem.
The progress made so far shows what's possible when governments, nonprofits, healthcare workers, and local communities work together.
How Your Purchase Helps
Every time you order contact lenses from Blue Planet Optics, you're helping support efforts to prevent avoidable blindness around the world.
For every box sold, we donate $1 to Sightsavers to help fund programs for diseases like River Blindness that distribute medication, train healthcare workers, educate communities, and strengthen local healthcare systems.
While your purchase may seem small on its own, it's part of a much greater effort that's helping protect the vision of millions of people.
Together, we can help create a future where diseases like river blindness no longer threaten people's sight.
FAQ
Is river blindness contagious?
No. River blindness cannot spread from person to person. It is transmitted through the bite of an infected blackfly.
Is river blindness curable?
Treatment can stop the disease from progressing and significantly reduce transmission. However, vision loss caused by permanent scarring usually cannot be reversed.
Is river blindness common in the United States?
No. River blindness is extremely rare in the United States. The overwhelming majority of cases occur in sub-Saharan Africa.
Why are blackflies important?
Blackflies are the insects that transmit the parasite responsible for river blindness. Without infected blackflies, the disease cannot spread.
How does Blue Planet Optics help?
Blue Planet Optics donates $1 for every box of contact lenses sold to Sightsavers. Those donations help support programs working to prevent avoidable blindness, including efforts to eliminate river blindness around the world.