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Keratitis Herpetic (Herpes Simplex Virus Eye Infection)

What is Keratitis Herpetic?

Keratitis herpetic is an inflammation of the cornea (the clear front surface of the eye) caused by infection with the herpes simplex virus (HSV), most commonly HSV‑1. The virus can invade corneal tissue either during a primary ocular infection or, more frequently, when the virus reactivates from a dormant state in the trigeminal ganglion. The condition may present as a single episode or recur repeatedly, and if left untreated it can lead to scarring, vision loss, or even blindness.

Because the cornea is essential for focusing light, any disruption—especially scarring or ulceration—can have a significant impact on visual acuity. Prompt recognition and treatment are therefore crucial.

Common Causes

While HSV‑1 is the primary pathogen, several factors can precipitate an outbreak or increase susceptibility to keratitis herpetic:

• Primary ocular herpes infection: Direct infection of the eye after contact with infected secretions.
• Reactivation of latent HSV: Stress, fever, hormonal changes, or immunosuppression can trigger the virus to awaken.
• Contact lens wear: Improper hygiene or extended-wear lenses can facilitate viral entry.
• Ocular trauma: Scratches, foreign bodies, or surgery may disrupt the corneal epithelium, allowing the virus to invade.
• Systemic illnesses: HIV/AIDS, diabetes, or other conditions that weaken immunity.
• Topical or systemic corticosteroids: Steroids suppress immune responses, increasing the risk of viral replication.
• Use of immunosuppressive medications: Biologics, chemotherapy, or organ‑transplant drugs.
• Cold sores (labial herpes): Individuals with frequent oral HSV lesions are at higher risk for ocular spread.
• Exposure to ultraviolet (UV) light: UV can trigger viral reactivation.
• Neurological conditions affecting trigeminal nerve: Rarely, lesions that irritate the nerve may precipitate eye involvement.

Associated Symptoms

Symptoms of herpes keratitis can vary with the stage and severity of the infection. Commonly reported findings include:

• Redness of the eye (conjunctival injection)
• Eye pain or a foreign‑body sensation
• Blurred or decreased vision
• Photophobia (sensitivity to light)
• Watery or mucoid discharge
• Feeling of gritty texture under the eyelid
• Fine, branching “dendritic” lesions visible with fluorescein staining
• Swelling of the eyelids (blepharitis) or surrounding tissues
• Recurrent episodes may cause corneal scarring, leading to permanent visual distortion (irregular astigmatism).

When to See a Doctor

Because herpes keratitis can progress rapidly, seek professional care promptly if you notice any of the following:

• Sudden onset of eye redness combined with pain or vision changes.
• Increased sensitivity to light that does not improve with over‑the‑counter eye drops.
• A sensation of something “stuck” on the eye that persists more than a day.
• Recurrent eye inflammation after a previous herpes keratitis episode.
• Any history of cold sores or known HSV infection and new eye symptoms.
• Use of corticosteroid eye drops without a clear prescription.

If you belong to a high‑risk group (e.g., immunocompromised, contact‑lens wearer, recent ocular surgery), err on the side of caution and schedule an appointment sooner rather than later.

Diagnosis

Diagnosis of herpes keratitis is primarily clinical, supported by several investigational tools:

1. Slit‑lamp examination: An eye‑care professional uses a microscope with a bright light to view the cornea. Characteristic dendritic (branching) ulcers stained with fluorescein confirm active infection.
2. Fluorescein staining: The dye highlights epithelial defects; a “geographic” pattern suggests stromal involvement.
3. Corneal scraping and PCR: In atypical cases, a small sample of corneal cells can be sent for polymerase chain reaction (PCR) testing to detect HSV DNA.
4. Serology: Blood tests for HSV‑1 IgG/IgM may support a diagnosis but are not definitive for ocular disease.
5. Confocal microscopy: Advanced imaging can visualize viral particles within corneal layers (available in specialty centers).

It is essential to differentiate herpes keratitis from bacterial, fungal, or Acanthamoeba keratitis, as treatment strategies differ markedly.

Treatment Options

Therapy aims to eradicate the virus, reduce inflammation, and prevent scarring. Management is typically a combination of prescription medication and supportive care.

Antiviral Medications

• Topical antivirals: Trifluridine 1% eye drops (e.g., Viroptic) used 5‑9 times daily for 7‑10 days. Ganciclovir gel 0.15% is an alternative with less toxicity.
• Oral antivirals: Acyclovir 400 mg five times daily, Valacyclovir 500 mg three times daily, or Famciclovir 250 mg three times daily for 7‑10 days. Oral agents are preferred for stromal keratitis or when compliance with frequent eye drops is problematic.
• Prophylactic suppressive therapy: For patients with frequent recurrences, low‑dose oral antivirals (e.g., Valacyclovir 500 mg once daily) may be continued long‑term.

Corticosteroids (when indicated)

Topical steroids are sometimes required for stromal inflammation, but they must be used only after antiviral therapy is established to prevent exacerbating viral replication. Typical regimens involve prednisolone acetate 1% drops, tapered over weeks under close supervision.

Adjunctive Measures

• Pain control: Oral analgesics (acetaminophen, ibuprofen) or cycloplegic drops (e.g., homatropine) to relieve ciliary spasm.
• Lubrication: Preservative‑free artificial tears several times daily to reduce epithelial desiccation.
• Contact lens hygiene: Discontinue lens wear until the infection resolves; disinfect lenses thoroughly or replace them.
• Avoidance of steroids: Do NOT use over‑the‑counter steroid eye drops without ophthalmologic guidance.

Follow‑up Care

Patients typically return for re‑evaluation within 48‑72 hours to confirm healing, adjust medication frequency, and monitor for complications such as scarring or secondary bacterial infection.

Prevention Tips

While HSV infection cannot be entirely eliminated, the risk of ocular involvement can be markedly reduced:

• Practice rigorous hand hygiene—wash hands with soap for at least 20 seconds before touching eyes.
• Avoid sharing towels, pillowcases, or cosmetics with someone who has an active cold sore.
• For contact‑lens wearers, follow the lens‑care schedule exactly; replace lenses and storage cases as recommended.
• Limit UV exposure: wear UV‑blocking sunglasses outdoors, especially after recovery from an episode.
• Manage stress through regular exercise, adequate sleep, and relaxation techniques.
• Control systemic conditions such as diabetes; maintain a healthy immune system.
• Discuss prophylactic antiviral therapy with an eye‑care specialist if you have ≥3 episodes per year.
• Never self‑medicate with steroid eye drops during an active eye infection.
• Seek prompt treatment for oral herpes outbreaks; topical antiviral therapy may reduce the chance of ocular spread.

Emergency Warning Signs

Key Take‑aways

Herpes keratitis is a potentially sight‑threatening infection caused by HSV‑1. Early recognition, prompt antiviral therapy, and careful follow‑up are essential to prevent scarring and vision loss. While the virus cannot be eradicated, lifestyle measures, prophylactic antivirals for frequent recurrences, and avoidance of risk factors (such as improper contact‑lens care and unsupervised steroid use) dramatically lower the odds of serious complications.

For reliable information, see the following reputable sources:

• Mayo Clinic – Herpes Eye Infection
• Cleveland Clinic – Herpes Eye Infection Overview
• American Academy of Ophthalmology – Herpes Simplex Keratitis
• National Institutes of Health – Management of Herpes Simplex Virus Keratitis
• World Health Organization – Herpes Simplex Virus Fact Sheet

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