Herpes Simplex Eye Infection: Symptoms, Risks and Treatment
Table of Contents
Key takeaways
- Herpes simplex can infect the eye and may damage the cornea if not treated promptly.
- A red, painful, watery, light-sensitive eye or blurred vision needs same-day professional advice.
- Treatment may include antiviral eye ointment, drops or tablets, but steroid eye drops must only be used under specialist supervision.
- Avoid contact lenses and do not touch the eye during an active infection unless a clinician advises otherwise.
Article type: medical_condition.
Overview
Herpes simplex eye infection happens when herpes simplex virus affects the eye, most often the cornea, the clear front window of the eye. It may follow a cold sore or occur when the virus reactivates in a nerve supplying the eye. Because the cornea is essential for clear vision, delayed treatment can lead to scarring, recurrent inflammation or sight loss. A red eye is common and often minor, but herpes simplex eye infection is one of the reasons that eye pain, light sensitivity or blurred vision should be assessed urgently rather than treated with leftover drops.
Symptoms and concerns
Herpes simplex eye infection can present differently from person to person. The pattern, duration, severity and associated symptoms matter because they help separate mild or expected symptoms from problems that need urgent assessment.
- redness, watering, grittiness or eye pain, often in one eye
- sensitivity to light or difficulty keeping the eye open
- blurred vision or reduced vision
- swelling around the eyelids or small blisters near the eye in some cases
- recurrent episodes affecting the same eye
Causes and mechanism
After a first herpes simplex infection, the virus can remain dormant in nerve tissue. Reactivation may send virus particles along the nerve towards the skin or eye surface. In the cornea, infection can damage the epithelial surface and trigger inflammation. Deeper inflammation can involve the corneal stroma or inside of the eye, increasing the risk of scarring and vision problems. Steroid drops can reduce inflammation in some eye conditions but may worsen active viral infection if used without antiviral cover and specialist oversight.
Risk factors
Risk factors do not mean someone will definitely develop the condition, and absence of risk factors does not rule it out. They help guide assessment and prevention conversations.
- previous cold sores, previous herpes eye infection or recurrent herpes simplex infection
- touching a cold sore then touching the eye without washing hands
- contact lens use during eye irritation or infection
- immune suppression, including some medicines or medical conditions
- eye injury, surgery or inflammation that disrupts the eye surface
Possible complications
Complications include corneal ulceration, scarring, reduced vision, recurrent keratitis, raised eye pressure and inflammation inside the eye. Repeated episodes can gradually damage the cornea. Contact lenses can increase the risk of additional infection when the eye surface is inflamed. The key safety point is that prompt antiviral treatment and ophthalmology review can reduce the risk of lasting damage.
Diagnosis and assessment
Assessment should be by an optometrist, GP with urgent referral pathway, eye casualty or ophthalmology service depending on severity and local access. The clinician may use fluorescein dye and a slit lamp to look for characteristic corneal changes. They will ask about cold sores, previous episodes, contact lens use, immune suppression and current medicines. Swabs are not always required, but may be used in uncertain or severe cases. Do not self-treat a painful red eye with old antibiotic or steroid drops.
Treatment and management
Treatment usually involves antiviral eye ointment or drops, and sometimes antiviral tablets. Pain relief and lubricating drops may be advised. Steroid drops are used only in selected inflammatory patterns under eye-specialist supervision. Contact lenses should usually be avoided until the infection has fully healed and an eye professional says it is safe. Recurrent or severe disease may need longer-term antiviral prevention after specialist review.
Assessment details that change care
For Herpes simplex eye infection, the details that most often change care are not just whether a symptom is present, but how quickly it started, whether it is worsening, whether it is recurrent, and whether it appears with other warning signs. A clinician will usually want to know about features such as redness, watering, grittiness or eye pain, often in one eye; sensitivity to light or difficulty keeping the eye open; blurred vision or reduced vision. They will also ask about context, including previous cold sores, previous herpes eye infection or recurrent herpes simplex infection; touching a cold sore then touching the eye without washing hands; contact lens use during eye irritation or infection. This is why a concise symptom diary can be useful: note the date symptoms started, what makes them better or worse, medicines already tried, pregnancy or menopause context where relevant, immune suppression, recent surgery or travel, and whether the problem is affecting sleep, eating, urination, sex, movement or work.
Severity is judged by combining symptoms, examination findings, risk factors and test results. A mild-looking symptom can matter more if it is new, escalating, associated with fever or systemic illness, or happening in a baby, pregnancy, older age or immune suppression. Equally, a visible lump, rash, blister or blood-test result may be less urgent when it is stable and the person is otherwise well. The safest approach is to avoid forcing the condition into a home diagnosis. Assessment-first language is especially important for Herpes simplex eye infection because treatment choices may differ according to anatomy, infection risk, recurrence pattern, underlying disease and personal circumstances.
Before an appointment, useful questions include: What diagnosis is most likely and what else needs to be ruled out? Which symptoms should trigger same-day help? Are tests needed now or only if symptoms persist? What treatment options are reasonable, what benefits are expected, and what limitations or side effects should be discussed? Are there activities, sex, contact lenses, exercise, lifting, pregnancy plans, baby contact or medicines that should be paused until review? This kind of practical planning helps turn a general article into safer, more useful health information.
Self-care and prevention
Wash hands before and after touching the face, avoid rubbing the eye, do not share towels, avoid contact lenses during symptoms, and replace lens cases or lenses if advised. Cold sore hygiene matters: avoid touching sores, wash hands and avoid transferring virus to the eye. Sunglasses may help light sensitivity, but they do not replace assessment. Seek advice quickly for any recurrence because early treatment is more effective.
When to seek medical advice
Seek same-day urgent advice for eye pain, light sensitivity, blurred vision, a red eye with contact lens use, a baby or child with eye symptoms, or symptoms in someone with immune suppression. Call NHS 111 for urgent advice if you cannot access an optometrist or eye service. Call 999 for major eye injury, sudden severe vision loss or life-threatening illness.
Sources
- NHS, Herpes simplex eye infections: https://www.nhs.uk/conditions/herpes-simplex-eye-infections/
Relevance: Supports symptoms, treatment, recurrence and urgent eye-care advice. - Mayo Clinic, Herpes simplex virus: mayoclinic.org guidance page link unavailable during validation (mayoclinic.org guidance page, link unavailable during validation)
Relevance: Supports herpes simplex latency and recurrence context used for eye infection explanation. - NICE CKS, Red eye: cks.nice.org.uk guidance page link unavailable during validation (cks.nice.org.uk guidance page, link unavailable during validation)
Relevance: Supports red-eye assessment and referral principles, including pain, photophobia and visual change.
Disclaimer
Educational only. Results vary. Not a cure. Use NHS 111 for urgent advice where symptoms are concerning or worsening, and call 999 in a life-threatening emergency.