Approximately 24,000 new cases of eye herpes are diagnosed in the United States each year, and an estimated 1 million new cases per year are diagnosed globally. Men are slightly more likely to get eye herpes than women.
The area of the eye affected depends on the type of eye herpes. Usually, the cornea (the normally clear dome that covers the front part of the eye) is affected, but eye herpes can reach the inside of the eye or the retina (the thin layer of tissue that lines the back of the eye on the inside).
Eye herpes can also cause inflammation of the eyelids, the conjunctiva (the clear tissue covering the white part of the eye and the inside of the eyelids), or the iris (the colored part of the eye that controls the amount of light entering the eye). Eye herpes cannot be cured, but it can be managed.
Types of Eye Herpes
There are two main types of eye herpes. Epithelial keratitis is the more common form of eye herpes, but stromal keratitis is more serious and can lead to blindness.
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Epithelial Keratitis
Epithelial keratitis accounts for an estimated 50%–80% of all ocular herpes infections. HSV epithelial keratitis affects the outermost layer of the cornea called the epithelium. The virus destroys corneal epithelial cells as it replicates.
Stromal Keratitis
Stromal keratitis affects the deeper layers of the cornea called the stroma. It is caused by a combination of viral infection and compromised immune mechanisms. Stromal keratitis can result in corneal scarring and loss of vision.
There are two types of stromal keratitis: stromal keratitis without ulceration and HSV stromal keratitis with ulceration.
Stromal keratitis without ulceration:
It is thought to occur from viral proteins being left behind in the cornea even after the infection has cleared up. The body produces an inflammatory response to these proteins, leading to stromal keratitis without necrosis (the death of tissue).
HSV stromal keratitis with ulceration:
It is less common than stromal keratitis without ulceration. It is also an immune response to the proteins left behind in the stroma. Instead of inflammation, tissue necrosis occurs, resulting in ulceration (the formation of an open sore) and destruction of the stromal bed.
Eye Herpes Symptoms
Symptoms of eye herpes include:
Like the herpes simplex virus, the herpes zoster virus stays dormant in the body once contracted, and you can have flare-ups, periods of reactivation and worsening symptoms.
Symptoms of herpes zoster ophthalmicus are similar to HSV eye infections but can also include:
Redness, rash, or sores on the eyelids and around the eyes (especially on the forehead) similar in appearance to poison ivy or poison oak blisters that turn into scabs over one to two weeks; a milder rash in younger people than in older people Swelling and cloudiness of the cornea Flu-like symptoms (low-grade fever, generally feeling unwell) Tingling and numbness in the forehead before the rash appears
Pain in and around (usually) only one eyeRedness of the eyeDecreased visionFeeling of dirt or grit in the eyeOverflowing tearsPain when looking at bright lightSwelling or cloudiness of the corneaDischarge from the eyeHeadacheRash with blisters on the eyelid(s)Painful sore on eyelid or eye surface
Eye Herpes vs. Pink Eye
Symptoms such as redness, pain, eyelid swelling, or discharge from the eye can occur with both eye herpes and pink eye (conjunctivitis), so eye herpes is sometimes mistaken for pink eye.
Pink eye can be caused by a bacterial infection, a viral infection, allergies, or chemical exposure, while eye herpes is always caused by a virus.
Pink eye can affect one or both eyes. While it is possible for eye herpes to occur in both eyes, it usually appears in just one eye. If the infection recurs within a year, it’s more likely to be viral rather than bacterial, or it may be from chemical exposure.
Because the symptoms for eye herpes and pink eye are similar and both can be caused by a virus, it is important to see a healthcare professional to get a proper diagnosis. Doing so will ensure the most effective treatment for either condition.
Healthcare professionals usually make a diagnosis of pink eye without doing a viral or bacterial culture. Occasionally, this leads to a missed eye-herpes diagnosis. If you have been diagnosed with pink eye, but it doesn’t seem to be clearing up with or without treatment, book a follow-up with your healthcare professional to rule out eye herpes.
Causes
Eye herpes is caused by the herpes simplex virus (HSV). While there are two forms of HSV that can cause eye herpes, it is usually caused by HSV-1, the same virus that causes oral herpes (cold sores or fever blisters).
While HSV-1 can be transmitted directly to the eye such as by touching a cold sore on the mouth and then touching the eye, eye herpes is often the result of a flare-up of an earlier HSV-1 infection in another part of the body (usually the mouth.)
HSV-1 is very common. Approximately 3.7 billion people under age 50 worldwide have HSV-1 infection. Seropositivity (antibodies found in the blood for a particular infection) for HSV-1 has been reported in 65% of Americans.
Most people in the United States will contract HSV-1, usually in childhood. Many people are unaware they carry the virus and it can remain dormant (inactive and asymptomatic) in the body indefinitely.
A flare-up, or breakout, can occur if the virus starts to multiply or moves from one area of the body to another. Flare-ups can be random, or they can be triggered by:
IllnessFeverWeather (strong sunlight or cold wind)Ultraviolet (UV) light exposure, including tanning bedsAn eye injuryStressMenstrual periods A weakened immune system (can be caused by certain medical conditions and treatments such as chemotherapy)Some medications
HSV is typically infectious during the five to 10 days the skin lesions are healing, as well as during asymptomatic shedding in saliva. Unlike genital herpes, eye herpes is not sexually transmitted.
There are some key differences between HSV-1 and HSV-2:
Diagnosis
Eye herpes is usually diagnosed by eye specialists called ophthalmologists or optometrists.
The eye specialist will take a health history and have a discussion of symptoms, including the items in the lists that follow.
Ocular symptoms:
Degree of pain Redness Discharge Presence or absence of blurred vision Whether you’re experiencing photophobia (sensitivity to light) When the symptoms started and how often they occur Circumstances surrounding the onset of symptoms
Contact lens history:
Whether you wear contact lenses When you wear contacts and for how long at a time Whether you wear contacts overnight Type of contact lens The lens solution used Contact lens hygiene practices and routines Whether you use tap water to rinse your contact lenses Whether you swim, use a hot tub, or shower while wearing contact lenses
Review of other ocular and medical history:
Risk factors, such as previous HSV keratitisReview of past or present eye conditionsReview of other past and present medical problems and conditionsCurrent and recently used medications, including medications for the eyesMedication allergies
The eye-care specialist will also perform an eye exam that includes checking for light sensitivity, vision, and general health.
Diagnostic tests and procedures the eye specialist may use include:
Measurement of visual acuity: Tests how well you see shapes and detailsExternal examination: Checks for things that can be seen on the outside of the eye, such as discharge, corneal sensation, and general appearance of the eyes, face, and eyelidsSlit-lamp biomicroscopy: Using a microscope that magnifies the surface and inside of the eyeFluorescein eye stain test: A close examination of the cornea after dye is placed on the surface of the eyeCulture sample: Taking a culture swab (a small collection of cells) and sending it to a lab for further examination
Treatment
The treatment for eye herpes depends on the type, location, and severity of the infection.
Epithelial Keratitis
Epithelial keratitis usually responds well to treatment and has no lasting major complications.
Treatment for epithelial keratitis may include:
Topical Antivirals
The most common topical antiviral agents for treating epithelial keratitis include:
Zirgan (ganciclovir 0. 15%) is generally dosed one drop five times daily until the ulcer is resolved, then three times daily for seven additional days. Viroptic (trifluridine 1%) is generally dosed one drop nine times daily in the affected eye until the ulcer is resolved.
Zirgan is often the first choice of topical treatment. While Viroptic is effective, it is known to be toxic, which can delay corneal healing.
Oral Antiviral Medications
Oral antiviral medications used to treat dendritic epithelial keratitis include:
Zovirax (acyclovir): Typically 400 milligrams five times daily for seven to 10 days Valtrex (valacyclovir): Typically 500 milligrams three times daily for seven to 10 days Famvir (famciclovir): Typically 250 milligrams two or three times daily for seven to 10 days
Geographic epithelial keratitis, another subset of epithelial keratitis, may require higher doses and a longer treatment period.
Oral antivirals are less expensive and have a more manageable dosing schedule than topical antivirals, so they are often a first-choice treatment. Oral antivirals should be used with caution in patients with kidney or liver disease.
Corneal Epithelial Debridement
This treatment involves wiping infected cells off the cornea with a dry, cotton-tipped applicator. Debridement removes approximately 90% of the virus in the eye. It can be combined with antiviral treatment.
Stromal Keratitis
Stromal keratitis is generally treated with oral antivirals along with topical steroids. Topical steroids reduce the inflammation caused by the immune response to the dead viral particles and help prevent corneal scarring. However, they can reactivate the epithelial disease. Taking oral antivirals along with topical steroids helps prevent this reactivation.
Prognosis
Eye herpes does not currently have a cure, but it can usually be managed without long-term complications. Eye herpes usually clears up with treatment in about one to three weeks.
Symptoms may improve before the end of the prescribed treatment, but it is important to finish your treatment plan as outlined by your doctor. If symptoms do not improve with treatment within two weeks, book a follow-up appointment.
The recurrence of ocular herpes is a concern. Those who have recurrent issues of live virus (such as with epithelial keratitis) may need to take long-term oral antivirals proactively. People who have recurrent stromal keratitis may need to take long-term steroid drops with either oral or topical antivirals.
If the eye herpes infection goes untreated or doesn’t respond to treatment, serious complications can occur such as:
Scarring of the cornea (may require a corneal transplant) Bacterial or fungal infections Glaucoma (damage to the optic nerve that can cause blindness) Permanent vision loss, although rare
The earlier treatment is started, the less risk there is for serious complications.
Summary
Eye herpes is caused by infection with the herpes simplex virus, with symptoms of redness, pain, and swollen eyelids. Epithelial keratitis is the more common type, but stromal keratitis is more serious because it can lead to blindness. It is treated with topical and oral antiviral medications, depending on the type and severity.
You can help reduce the risk of transmission by:
Avoiding touching your eyes if you have cold soresWashing your hands after you touch your lips during an outbreak, and practicing good handwashing habits in generalNot sharing eye drops or eye makeup with othersKeeping your contact lenses clean and throwing out contacts you were wearing when a breakout of eye herpes occurredTaking antiviral medication as prescribed
A Word From Verywell
While eye herpes can’t be cured, outbreaks can be managed, and well-managed outbreaks reduce the risk of damage to the eye. Recurrent outbreaks can often be prevented by taking preventive measures, such as long-term antiviral medication.
If you have symptoms of eye herpes—even if you think it may just be pink eye—see your healthcare professional or eye-care specialist for a proper diagnosis and treatment plan. A doctor can prescribe the necessary medications to help heal you.
