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Keratitis: Corneal Inflammation and Infection
Recognizing the Symptoms
Keratitis usually makes itself known quickly. Most people notice something is wrong within a day or two of onset. Anyone who wears contact lenses and develops these symptoms should remove their lenses immediately and contact an eye doctor.
Eye pain and redness are the most common early signs of keratitis. The pain may feel like a steady, deep ache or a sharper, more sudden sensation. Redness often starts around the iris (the colored part of the eye) and spreads outward. Either sign on its own deserves a same-day eye appointment.
The affected eye typically waters more than normal. Yellow or green discharge may appear, and thick mucus can blur vision, especially first thing in the morning. These signs, particularly colored discharge, often suggest a bacterial cause.
Photophobia, or sensitivity to bright light, is a hallmark symptom of corneal inflammation. Vision in the affected eye may appear foggy or hazy. A gritty feeling, similar to having a grain of sand stuck under the eyelid, is also very common and can be persistent.
Any combination of eye pain, redness, and reduced vision warrants urgent attention. This is especially true for contact lens wearers or after any scratch or injury to the eye. Waiting to see if symptoms improve on their own can allow the condition to worsen, leading to corneal scarring or permanent vision loss. Reach out to your eye doctor or an urgent eye care clinic the same day symptoms begin.
Causes and Risk Factors
A range of factors can trigger or contribute to keratitis. Some risks are within your control, while others require ongoing management alongside your broader medical team. Understanding your personal risk profile helps you and your eye doctor stay ahead of the problem.
Contact lens wear is the leading risk factor for microbial (germ-caused) keratitis in developed countries. Wearing lenses overnight, using tap water to rinse or store lenses, and poor hand hygiene before lens handling all significantly raise the risk. Daily disposable lenses may reduce risk compared to extended-wear or reusable lenses. Never rinse contact lenses or their case in tap water under any circumstances.
A scratch from a tree branch, a fingernail, or an airborne particle can break the surface of the cornea and open a path for infection. Yard work and farm work carry added risk because plant material can carry fungal spores. Wearing appropriate eye protection during work around tools, debris, or vegetation is one of the simplest and most effective ways to lower your risk.
Dry eye disease, eyelid inflammation (blepharitis), and a history of herpes simplex eye infections can all make the corneal surface more vulnerable to keratitis. A compromised eye surface simply has less natural defense against germs and injury. Treating these baseline conditions consistently is an important part of reducing long-term risk.
Steroid eye drops can suppress the eye's immune response and allow infections to progress more quietly. Long-term steroid use, medications taken after organ transplant, and poorly controlled diabetes each raise the risk of serious keratitis. Autoimmune diseases can also drive non-infectious forms. Always share your complete medication list with your eye doctor, including any drops you use on your own.
How Keratitis Is Diagnosed
Diagnosis begins with your history and a thorough examination. Your eye doctor needs to identify the type of keratitis driving your symptoms in order to choose the right treatment. Even a short delay in identifying the cause can affect how well the eye responds to care.
The slit-lamp exam is the standard starting point. This instrument combines a magnifying microscope with an intense, focused beam of light, allowing your eye doctor to examine the cornea in detail. Your doctor looks for corneal haze, white patches called infiltrates, or breaks in the surface called ulcers. The size, shape, and pattern of these findings help identify which type of keratitis is most likely.
When there is a suspicious patch on the cornea, especially one that threatens central vision or is not responding to initial treatment, a corneal scraping may be performed. A tiny sample from the affected area is sent to the laboratory. Gram staining, culture, and PCR (a molecular test that can identify specific organisms) help pinpoint the exact germ responsible so that the most targeted treatment can be chosen.
Confocal microscopy is a specialized imaging tool that examines the cornea at a cellular level. It is particularly useful for detecting hard-to-find organisms such as Acanthamoeba. Optical coherence tomography, or OCT, can map the depth of an infection or scar within the corneal layers. These advanced tools are most commonly used in complex or treatment-resistant cases.
Being prepared to share your full history helps your eye doctor narrow down the cause much more quickly. Let your doctor know about your contact lens habits, any recent eye injury, exposure to pool or river water, recent travel, and any autoimmune or immune-suppressing conditions you have. A complete picture from the start leads to faster, more accurate care.
Treatment Options
Treatment is always matched to the specific type and severity of keratitis. Eye drops are the foundation of care for most cases, and patients who seek help early typically do very well. Surgery is reserved for cases that are severe, deeply progressed, or not responding to medication.
Bacterial keratitis is typically treated with concentrated antibiotic eye drops, often dosed every hour or two during the first days of treatment, including overnight. As the eye improves, your doctor will gradually reduce the frequency. Staying consistent with dosing matters greatly, because missing treatments can allow bacteria to recover and the infection to worsen.
Herpes simplex keratitis is treated with antiviral eye drops or oral antiviral medications. Oral antivirals may be continued for several months after the active infection to reduce the risk of recurrence. Steroid drops can be used in certain presentations, but only under careful supervision and alongside antiviral coverage, since using steroids alone can cause a herpes infection to spread and worsen.
Fungal keratitis requires antifungal eye drops, and treatment often continues for weeks. Acanthamoeba keratitis requires a combination of antimicrobial drops and typically takes even longer to resolve, sometimes several months. These cases are usually managed by cornea specialists. Pain management and surface support are important parts of the overall care plan throughout treatment.
The approach to non-infectious keratitis depends on the underlying cause. Dry eye-related keratitis is treated with lubricating drops, prescription anti-inflammatory drops, or punctal plugs (tiny devices inserted into the tear drainage openings to keep moisture on the eye). Exposure keratitis may require overnight ointment or moisture chambers. Autoimmune-driven cases sometimes require oral immune-modulating medications in coordination with a rheumatologist or other specialist. Neurotrophic keratitis, in which the cornea loses sensation, may respond to specialized nerve growth factor drops.
A deep ulcer that is not healing with medication alone may benefit from an amniotic membrane graft, a thin biological tissue placed over the cornea to support healing and reduce inflammation. Corneal perforation (a hole in the cornea) is a surgical emergency requiring immediate repair. After an infection has fully cleared, corneal transplant surgery may be considered to restore vision lost to scarring.
Frequently Asked Questions
These questions come up often and are worth addressing outside of the exam room. If you have additional concerns, bring them to your next visit so our eye doctors can give you guidance specific to your situation.
Yes, in most cases. Keratitis can progress from a minor-looking irritation to a sight-threatening ulcer within days. Same-day evaluation is the standard recommendation when you have a painful, red eye with any change in vision. If you wear contact lenses, remove them before going to the clinic and bring the lenses and case with you, as the case can sometimes help the lab identify the responsible organism.
Most forms of keratitis are not contagious from person to person. Herpes simplex keratitis, for example, is typically a reactivation of a virus already living in your own nervous system rather than something caught from another person. That said, sharing eye makeup, contact lens cases, or lens care solutions is a known way to transfer bacteria or other germs. Keep all your eye care supplies to yourself.
No. Your eye doctor will ask you to stop all contact lens wear while the infection or inflammation is being treated. Continuing to wear lenses can trap bacteria against the cornea, interfere with medication, and significantly slow healing. When your doctor confirms the infection has fully resolved, switching to a fresh pair of lenses and a brand-new case is strongly advised, since your previous case may harbor the same germs that caused the problem.
Many patients who receive prompt treatment recover their vision completely. The main factor that affects the final visual outcome is whether scarring forms near the center of the cornea, the area most critical for clear sight. Central scars can leave lasting blurriness that glasses or contact lenses may not fully correct. In those situations, corneal transplant surgery can restore meaningful vision, though the decision involves careful timing and specialist evaluation.
The length of treatment depends heavily on the type and severity of keratitis. Straightforward bacterial cases may resolve within one to two weeks. Deeper ulcers or more resistant infections can require several weeks of drops. Fungal and Acanthamoeba cases often require months of consistent treatment. It is important to complete the full course of treatment even after your eye feels comfortable, because stopping early can allow the infection to return.
Safe contact lens habits are the single most effective daily practice for reducing risk. A few consistent steps can make a meaningful difference over time.
- Wash your hands thoroughly before touching your lenses or your eyes.
- Replace your lenses on the schedule your eye doctor recommended.
- Never rinse lenses or their case in tap water or any non-sterile solution.
- Replace your contact lens case at least every three months.
- Remove lenses before swimming, using a hot tub, or any water exposure.
- Avoid sleeping in lenses unless your eye doctor has specifically approved it for your lens type.
Schedule an Appointment for Corneal Care
A red, painful eye with any change in your vision deserves prompt attention from an experienced eye care team. At NewView Eye Center, our eye doctors are equipped to evaluate and treat keratitis at both our Reston and Leesburg offices, with access to advanced diagnostic tools and a full range of treatment options. We are here to help you protect your corneal health and your vision for the long term. Contact us to schedule your appointment today.
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