Can Lyme Disease Cause Optic Neuritis? Vision Loss, Symptoms, and Treatment

Lyme disease can rarely cause optic neuritis.
Vision loss may occur even without a bull’s-eye rash.
Prompt diagnosis and treatment often lead to improvement.

Can Lyme disease cause optic neuritis? Yes, although it is uncommon. Optic neuritis is an inflammatory disorder affecting the optic nerve that can cause blurred vision, loss of color intensity, decreased color vision, central blind spots (scotomas), and pain with eye movement. While optic neuritis is more commonly associated with multiple sclerosis (MS) and other inflammatory disorders, published case reports and small case series suggest that Lyme disease should also be considered in appropriate clinical settings, particularly in endemic areas.

Because optic neuritis has many potential causes, diagnosing Lyme disease requires careful clinical evaluation together with appropriate laboratory testing. Lyme disease remains primarily a clinical diagnosis supported by laboratory testing. A history of tick exposure, compatible symptoms, and positive Lyme testing may help distinguish Lyme-associated optic neuritis from other causes.

Patients with ocular symptoms related to Lyme disease may also experience other visual complaints. Learn more about ocular Lyme disease and the range of eye manifestations reported with Lyme borreliosis.

In the largest systematic review of Lyme-associated optic neuritis to date, Lu and colleagues reviewed published cases and described an additional patient with bilateral optic neuritis associated with Lyme borreliosis. Their findings highlight several clinical features that differ from the more typical presentation of optic neuritis associated with multiple sclerosis.

What is optic neuritis?

Optic neuritis is inflammation of the optic nerve, which carries visual information from the eye to the brain. Patients commonly experience blurred vision, loss of color intensity, pain with eye movement, and visual field defects such as a central scotoma. Vision loss typically develops over hours to several days.

Eye examination may reveal decreased color vision, a relative afferent pupillary defect (RAPD), optic disc swelling, or visual field abnormalities. MRI of the orbits is often helpful in confirming inflammation of the optic nerve and evaluating for alternative causes.

Although optic neuritis is most frequently associated with demyelinating diseases such as multiple sclerosis, infections, autoimmune disorders, and other inflammatory conditions can also affect the optic nerve. Lyme disease is considered an uncommon but recognized infectious cause.

A patient with multiple sclerosis developed bilateral optic neuritis

The case involved a 48-year-old woman with a history of multiple sclerosis (MS) who initially presented to her primary care physician with fever and sore throat.

Three weeks later, she returned complaining of photophobia, a sensation of eye pressure, blurry vision, pain with eye movements, and a central scotoma that had developed the morning before her visit. A scotoma is a blurry or blind spot within the visual field while the surrounding vision remains normal.

Because optic neuritis commonly occurs in patients with multiple sclerosis, distinguishing an MS relapse from another underlying condition required careful evaluation.

MRI of the orbits together with fundus examination confirmed the diagnosis of bilateral optic neuritis.

Two months before becoming ill, the patient’s husband had removed a tick from her leg. She did not recall developing an erythema migrans (bull’s-eye) rash.

Testing for Lyme disease was positive by two-tier serologic testing, including confirmatory Western blot.

Because of significant optic nerve swelling, the patient was hospitalized and treated with intravenous methylprednisolone (1 g/day for 3 days), followed by intravenous ceftriaxone (2 g/day for 25 days) for Lyme disease.

One week after discharge, the patient’s visual symptoms had resolved, and she had returned to her previous neurologic baseline, according to the investigators.

Lyme disease should be considered in selected patients with optic neuritis

The authors concluded that clinicians practicing in Lyme-endemic regions should consider Lyme borreliosis in patients with bilateral optic nerve head swelling and progressive visual loss, particularly when the presentation is atypical for classic demyelinating optic neuritis.

Importantly, optic neuritis remains an uncommon manifestation of Lyme disease, and most published evidence consists of case reports and small case series. Lyme disease should therefore be interpreted within the context of the patient’s clinical history, examination findings, exposure risk, and laboratory results.

The diagnosis should also take into account other potential causes of optic neuritis, including multiple sclerosis, neuromyelitis optica spectrum disorder, myelin oligodendrocyte glycoprotein (MOG)-associated disease, autoimmune disorders, and viral infections.

What did the literature review find?

To better characterize Lyme-associated optic neuritis, Lu and colleagues performed a systematic review of the published literature. After screening more than 600 reports, they identified 11 patients with optic neuritis and confirmed Lyme borreliosis that met their inclusion criteria.

The most frequently reported symptoms were:

Clinical finding	Reported cases
Blurry vision	11
Headache	7
Central scotoma	3
Pain with eye movement	3

Additional manifestations included paresthesias, ataxia, arthralgia, fatigue, weakness, and myalgia.

Only 2 of the 11 patients developed an erythema migrans (bull’s-eye) rash, while most patients did not recall a tick bite. Moderate vision loss was reported in most cases.

The authors observed that Lyme-associated optic neuritis often differed from the classic presentation of optic neuritis associated with multiple sclerosis. Rather than acute unilateral vision loss, these patients more commonly presented with bilateral optic nerve head swelling and moderate, progressive visual loss.

Most reported patients improved after antibiotic therapy, with some also receiving corticosteroids when clinically indicated. Because the evidence consists primarily of case reports and small case series, these findings should be interpreted cautiously.

Can Lyme disease cause blindness?

Permanent blindness from Lyme disease appears to be uncommon. However, Lyme-associated optic neuritis and other ocular manifestations can lead to temporary or, less commonly, permanent visual impairment, particularly if diagnosis and treatment are delayed. In the published cases reviewed by Lu and colleagues, most patients experienced improvement following appropriate antibiotic therapy, although the degree of visual recovery varied.

Because optic neuritis has many possible causes, including multiple sclerosis, neuromyelitis optica spectrum disorder, myelin oligodendrocyte glycoprotein (MOG)-associated disease, viral infections, and autoimmune disorders, Lyme disease should be considered as part of the differential diagnosis rather than assumed to be the cause.

Patients who develop sudden blurred vision, decreased color vision, pain with eye movement, or visual field defects should undergo prompt ophthalmologic and neurologic evaluation.

Frequently Asked Questions

Can Lyme disease cause optic neuritis?

Yes. Although uncommon, Lyme disease has been associated with optic neuritis in published case reports and small case series. It should be considered in patients with compatible symptoms, possible tick exposure, and supportive laboratory testing.

Can Lyme disease cause blurry vision?

Yes. Blurred vision was the most commonly reported visual symptom in the published cases of Lyme-associated optic neuritis. However, blurred vision has many possible causes, so prompt medical evaluation is important.

Can Lyme disease cause blindness?

Permanent blindness is uncommon, but untreated optic neuritis or other ocular manifestations of Lyme disease may lead to significant visual impairment. Early diagnosis and treatment improve the likelihood of visual recovery.

Is optic neuritis usually painful?

Typical optic neuritis often causes pain with eye movement. However, Lyme-associated optic neuritis may present differently, with bilateral optic nerve swelling and progressive visual loss that may be painless.

Can optic neuritis affect both eyes?

Yes. Although optic neuritis often affects one eye, bilateral involvement can occur. Bilateral optic nerve swelling was a common finding among the published Lyme disease cases reviewed by Lu and colleagues.

Does optic neuritis always mean multiple sclerosis?

No. Multiple sclerosis is one of the most common causes of optic neuritis, but infections such as Lyme disease, autoimmune disorders, and other inflammatory conditions can also affect the optic nerve. Careful clinical evaluation is necessary to determine the underlying cause.

Clinical Takeaway

Optic neuritis is an uncommon but recognized manifestation of Lyme disease. Because optic neuritis is more commonly associated with multiple sclerosis and other inflammatory disorders, Lyme disease may not be considered initially.

In Lyme-endemic regions, clinicians should include Lyme disease in the differential diagnosis of patients with atypical optic neuritis, particularly when bilateral optic nerve swelling, progressive visual loss, a history of tick exposure, or supportive laboratory findings are present. Lyme disease remains primarily a clinical diagnosis supported by laboratory testing.

Published evidence is limited primarily to case reports and small case series, but the available literature suggests that most patients improve following appropriate antibiotic therapy, with some also receiving corticosteroids when clinically indicated. Treatment decisions should be individualized after alternative causes of optic neuritis have been carefully evaluated.

Recognizing this uncommon manifestation of Lyme disease may lead to earlier diagnosis, appropriate treatment, and improved visual outcomes.

Related Articles

Learn more about ocular and neurologic manifestations of Lyme disease:

Ocular Lyme disease: Eye symptoms and complications
Visual changes due to Lyme disease
Lyme disease associated with eye problems
Lyme disease symptoms guide

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Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.

Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention