Keratitis is a serious cornea inflammation that requires prompt medical care to prevent vision loss. Learn about bacterial, viral, and contact lens-related risks.
Keratitis (Corneal Inflammation & Ulcers): Causes, Symptoms, and Treatment
Keratitis is the inflammation or infection of the cornea, the clear, dome-shaped window covering the front of your eye. Unlike minor eyelid issues like styes, keratitis is a medical emergency. If left untreated or if it recurs frequently, corneal inflammation can lead to permanent corneal scarring and irreversible vision loss.
Understanding the triggers, recognizing the warning signs, and seeking early clinical treatment are vital to protecting your sight.
What Causes Keratitis?
Keratitis is broadly categorized into infectious and non-infectious forms. It is highly prevalent among individuals who wear contact lenses incorrectly.
1. Infectious Keratitis
- Bacterial Infections: Often caused by Pseudomonas aeruginosa or Staphylococcus aureus, these infections are highly aggressive and heavily linked to improper contact lens hygiene.
- Viral Infections: The Herpes Simplex Virus (HSV)—the same virus responsible for cold sores—is a leading cause of severe viral keratitis, which can cause chronic dendritic scarring. The Varicella-Zoster virus (shingles) can also trigger it.
- Fungal Infections: Caused by environmental fungi or plant material scratching the eye, fungal ulcers are exacerbated by the chronic overuse of steroid eye drops.
- Parasitic Infections: Acanthamoeba is a microscopic amoeba found in tap water, hot tubs, and swimming pools that can contaminate contact lenses, causing an incredibly painful and difficult-to-treat infection.
2. Non-Infectious Keratitis
- Corneal Injuries: Superficial scratches, fingernail nicks, or foreign bodies break the corneal epithelium, providing an entry point for pathogens.
- Severe Dry Eye Syndrome: A lack of quality tears removes the eye's natural chemical and physical defense systems, leading to surface inflammation and ulceration.
- Chemical Exposure: Toxic splashes, household cleaner fumes, or intense UV radiation exposure (photokeratitis) can damage the corneal surface.
Recognizing Keratitis Symptoms
If you suspect you have keratitis, look out for these prominent clinical symptoms:
- Severe, sharp eye pain
- Significant eye redness and eyelid swelling
- Extreme sensitivity to light (photophobia)
- Excessive tearing or thick, purulent discharge
- A persistent foreign body sensation (feeling like something is in your eye)
- Blurred, hazy, or reduced vision
- A visible white or grey spot on the clear part of the eye
Clinical Diagnosis and Medical Treatment
Critical Safety Notice: Keratitis cannot be safely treated with home remedies or self-scraping. Standard eye patches should generally be avoided unless specifically directed by a doctor, as trapping an infectious bacterial ulcer under a dark, warm patch can rapidly accelerate corneal melting and blindness.
An eye specialist will diagnose keratitis using a slit-lamp microscope and may use a yellow fluorescein dye strip to highlight corneal tissue defects under blue light. Depending on the exact cause, a physician will formulate a specialized treatment plan:
- Prescription Antimicrobial Drops: High-frequency, broad-spectrum antibiotic drops (e.g., fluoroquinolones) are used for bacterial ulcers. Antifungal drops (like natamycin) or specialized antiviral medications (such as trifluridine or oral acyclovir) are prescribed for fungal and herpes infections respectively.
- Lubrication and Surface Management: For non-infectious keratitis stemming from severe dryness, preservative-free artificial tears, autologous serum drops, or lubricating ointments are utilized.
- Surgical Intervention: If a corneal ulcer leads to profound scarring that permanently blocks vision, a corneal transplant (keratoplasty) may be required to restore sight.
Prevention Tips for Contact Lens Wearers
Because contact lens wear is the single biggest modifiable risk factor for infectious corneal ulcers, practicing strict hygiene rules is paramount:
- Never sleep in your lenses unless explicitly prescribed extended-wear lenses by your eye doctor.
- Always wash and dry hands completely before handling lenses or touching your eyes.
- Never use tap water or saliva to rinse lenses; always use fresh, sterile multipurpose disinfecting solution.
- Replace your lens case every 3 months and clean it daily with solution, leaving it upside down to air dry.
- Remove lenses immediately if your eye becomes red, painful, watery, or irritated.
Frequently Asked Questions (FAQ)
Can keratitis heal on its own?
Non-infectious, minor superficial keratitis caused by a mild scratch may heal quickly if the irritant is removed. However, infectious keratitis (bacterial, viral, or fungal) will not resolve on its own and can progress to cause severe, permanent corneal damage within 24 to 48 hours without medical intervention.
How do I know if I have conjunctivitis (pink eye) or keratitis?
While both conditions cause eye redness, conjunctivitis primarily involves itching, burning, and a gooey discharge without altering your vision or causing intense pain. Keratitis is characterized by severe, sharp eye pain, extreme sensitivity to light, and hazy or blurred vision.
Is herpes simplex keratitis curable?
Herpes simplex keratitis can be effectively managed and forced into remission using targeted antiviral eye drops or oral medications. However, the virus remains dormant in the body's nerve tissues and can reactivate during times of stress, illness, or UV exposure, requiring ongoing monitoring by an eye care specialist.