Most people have experienced eye irritation at some point, but not all eye problems are harmless. Infectious keratitis is a serious eye infection that can lead to permanent vision loss if it is not diagnosed and treated quickly.
The condition affects the cornea, the clear dome-shaped surface that protects the front of the eye and helps focus light. While infectious keratitis is treatable, early intervention is critical to protecting sight.
What Is Keratitis?
Keratitis is the medical term for inflammation of the cornea. At KeraLink, our work focuses on infectious keratitis, a form of keratitis caused by microorganisms such as bacteria, viruses, or fungi.
These pathogens can invade the cornea through injury, contaminated contact lenses, or other forms of exposure, where they begin to multiply. As the body responds to the infection, inflammation develops, often causing pain, redness, and vision changes.
“Infectious keratitis is an eye infection that can result in pain, redness, vision clouding, and even permanent blindness if not treated quickly and correctly.”
– Allie Sibole, Principle Engineer at KeraLink International
What Happens When Someone Develops Keratitis?
When an infection takes hold, the pathogen begins to replicate in the cornea, triggering the body’s inflammatory response. As the inflammation increases, the infection can damage corneal tissue and lead to the formation of a corneal ulcer. These ulcers often appear as painful white spots on the eye and can grow deeper if left untreated.
Even when the infection is successfully treated, the healing process may leave behind corneal scarring and affect vision.
Who Is Most at Risk?
The risk factors for infectious keratitis vary depending on where people live, their lifestyle, and occupation.
In the United States and other high-income countries, infectious keratitis is commonly associated with contact lens misuse. Leaving lenses in too long, wearing them while swimming, or failing to clean them properly can increase the risk of infection.
In many low- and middle-income countries, eye injuries are a leading cause. Farmers, factory workers, and others who perform manual labor are at greater risk of eye trauma from flying debris, dust, or plant material.
“The eye is good at fending off diseases as long as it is undamaged.”
– Allie Sibole, Principle Engineer at KeraLink International
This is one reason why protective eyewear plays such an important role in preventing eye infections.
Common Symptoms
Symptoms of infectious keratitis can develop quickly and may include:
- Eye pain
- Redness
- Irritation
- Sensitivity to light
- Eye discharge
- Blurred or impaired vision
- White patches or ulcers on the cornea
Anyone experiencing these symptoms should seek medical attention promptly.
How Serious Is Keratitis?
Infectious keratitis is a serious eye infection that can have lasting consequences if not treated promptly. Without appropriate treatment, the infection can cause permanent corneal scarring, vision impairment, and, in severe cases, blindness. For some patients, the damage becomes so extensive that a corneal transplant is required to restore vision.
The good news is that most people experience favorable outcomes when the infection is identified and treated early.
How Is Keratitis Diagnosed and Treated?
Eye care professionals diagnose infectious keratitis through a comprehensive eye examination, patient history, and, when available, laboratory testing.
If needed, a small sample from the infected area may be collected and analyzed to determine whether bacteria, fungi, or another pathogen is causing the infection. This helps providers select the most effective treatment.
Treatment typically involves medications that target the specific cause of the infection:
- Antibiotics for bacterial infections
- Antivirals for viral infections
- Antifungals for fungal infections
While treatment is often successful, it can require frequent medication use and close follow-up care.
How Can You Prevent Keratitis?
Many cases of infectious keratitis can be prevented through simple precautions and good eye health practices.
To reduce your risk:
- Wear safety eyewear during yard work, sports, or machinery use.
- Follow proper contact lens hygiene and replacement schedules.
- Never wear contact lenses while swimming.
- Seek medical care promptly if you experience eye pain, redness, or changes in vision.
- Protecting the eye from injury and infection is one of the most effective ways to preserve long-term vision.
Looking Ahead
Infectious keratitis remains a significant cause of preventable vision loss worldwide. Through improved diagnosis, treatment, and prevention efforts, more people can receive the care they need before permanent damage occurs.
At KeraLink, we are working to improve access to fast, accurate diagnosis and advancing innovative treatment solutions that can help prevent corneal blindness. By increasing awareness and supporting the development of new technologies, we hope to reduce the global burden of infectious keratitis and help preserve sight for people around the world.
Expert Contributor: Allie Sibole, Principle Engineer, KeraLink International