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

Lyme disease is an uncommon cause of optic neuritis.
A 2026 consensus includes Lyme in the infectious differential.
Sudden or progressive vision loss requires prompt evaluation.

Can Lyme disease cause optic neuritis? Yes, although it is uncommon. Optic neuritis is inflammation of the optic nerve that can cause blurred vision, decreased color vision, central blind spots, and pain with eye movement.

Multiple sclerosis (MS), neuromyelitis optica spectrum disorder (NMOSD), and myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD) are important causes of optic neuritis. However, infections can also affect the optic nerve.

A 2026 consensus statement on the diagnosis and management of optic neuritis specifically includes Borrelia, the bacteria responsible for Lyme disease, among the infectious causes clinicians may need to consider.¹ The consensus also lists Lyme disease among the infections for which targeted testing may be appropriate when the clinical picture raises suspicion.

This does not mean that every patient with optic neuritis should be tested for or diagnosed with Lyme disease. Rather, Lyme disease remains one potentially treatable infectious diagnosis to consider when the patient’s symptoms, exposure history, examination, and other findings support that possibility.

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.

What is optic neuritis?

Optic neuritis is inflammation of the optic nerve, which carries visual information from the eye to the brain. Symptoms commonly develop over hours to several days and may include:

• Blurred or reduced vision
• Loss or fading of color vision
• Pain with eye movement
• Central blind spots or other visual field defects

Examination may reveal decreased color vision, a relative afferent pupillary defect, optic disc swelling, or visual field abnormalities. MRI of the brain and orbits is often an important part of the evaluation.

The 2026 consensus emphasizes that identifying the underlying cause matters because optic neuritis represents a group of disorders rather than a single disease.¹ Evaluation may include MRI and testing for antibodies associated with NMOSD and MOGAD, while additional infectious or autoimmune testing is guided by the clinical presentation.

New 2026 consensus includes Lyme disease in the differential

The 2026 consensus statement was developed by a multidisciplinary group of 19 specialists to provide a practical framework for diagnosing and managing optic neuritis.¹

Importantly for patients with possible tick-borne disease, the consensus includes Borrelia among bacterial infections associated with optic neuritis. It also lists Lyme disease under infectious disease screening that may be performed when clinically suspected.

The purpose of such testing is to identify potentially treatable infections. The consensus further notes that when optic neuritis has an infectious cause, treatment should be directed at the responsible pathogen.¹

This strengthens an important clinical point: Lyme disease is not one of the most common explanations for optic neuritis, but it should not automatically be excluded when the clinical and epidemiologic history raises reasonable suspicion.

A patient with multiple sclerosis developed bilateral optic neuritis

A previously published case illustrates why considering alternative causes can sometimes be important.

The case involved a 48-year-old woman with a history of multiple sclerosis who initially presented to her primary care physician with fever and sore throat.²

Three weeks later, she developed photophobia, a sensation of eye pressure, blurry vision, pain with eye movements, and a central scotoma. A scotoma is a blurry or blind spot within the visual field while the surrounding vision remains visible.

Because optic neuritis commonly occurs in patients with multiple sclerosis, an MS-related episode would have been an understandable consideration.

However, MRI of the orbits and fundus examination confirmed bilateral optic neuritis, and the history revealed another clue: two months earlier, the patient’s husband had removed a tick from her leg. She did not recall developing an erythema migrans (bull’s-eye) rash.

Two-tier Lyme serologic testing was positive.

Because of significant optic nerve swelling, the patient was hospitalized and treated with intravenous methylprednisolone followed by intravenous ceftriaxone for Lyme disease. One week after discharge, her visual symptoms had resolved and she had returned to her previous neurologic baseline, according to the investigators.²

Lyme disease should be considered in selected patients with optic neuritis

The case and subsequent systematic review suggested that Lyme borreliosis should be considered in patients with optic neuritis when the presentation is atypical for classic demyelinating optic neuritis and the epidemiologic history supports possible Lyme disease.²

The 2026 consensus provides additional support for this approach by formally including Borrelia in the infectious differential diagnosis of optic neuritis and Lyme disease among targeted infectious tests when clinically suspected.¹

Factors that may increase consideration of Lyme disease can include:

• Possible tick exposure
• Residence in or travel to an area where Lyme disease occurs
• Other symptoms compatible with Lyme disease
• An atypical pattern of optic neuritis
• Supportive Lyme disease laboratory findings

These findings are not specific for Lyme disease. The diagnosis must be considered alongside other causes of optic neuritis, including MS, NMOSD, MOGAD, autoimmune disease, and other infections.

What did the Lyme optic neuritis literature review find?

Lu and colleagues performed a systematic review to better characterize Lyme-associated optic neuritis.² After screening more than 600 reports, they identified 11 patients with optic neuritis and confirmed Lyme borreliosis who 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 rash, while most patients did not recall a tick bite.

The authors observed that reported Lyme-associated cases sometimes differed from classic MS-associated optic neuritis. Rather than acute unilateral vision loss, several patients presented with bilateral optic nerve head swelling and more progressive visual loss.²

Most reported patients improved after antibiotic treatment, with some also receiving corticosteroids. Because these observations come largely from case reports and small case series, they should be interpreted cautiously.

Why identifying an infectious cause matters

Optic neuritis is often treated with high-dose corticosteroids in appropriate clinical circumstances. However, treatment ultimately depends on the underlying cause.

The 2026 consensus specifically distinguishes infectious optic neuritis from other forms and states that infectious causes require appropriate antimicrobial treatment directed at the responsible pathogen.¹

This does not mean corticosteroids are inappropriate whenever an infection is present. Some reported patients with Lyme-associated optic neuritis have received both corticosteroids and antibiotic therapy. Rather, the important point is that recognizing a potentially treatable infection can affect the overall management plan.

Can Lyme disease cause blindness?

Permanent blindness from Lyme disease appears to be uncommon. However, Lyme-associated optic neuritis and other ocular manifestations can produce substantial visual impairment, and recovery may vary.

The broader 2026 optic neuritis consensus emphasizes the importance of timely diagnosis because delayed or incorrect treatment of optic neuritis can sometimes result in irreversible optic nerve damage.¹

Sudden vision loss, rapidly worsening blurred vision, decreased color vision, significant eye pain, or a new visual field defect warrants prompt ophthalmologic or neuro-ophthalmologic evaluation. Lyme disease is only one of many possible explanations for these symptoms.

Frequently Asked Questions

Can Lyme disease cause optic neuritis?

Yes. Lyme disease is an uncommon but recognized infectious cause of optic neuritis. A 2026 consensus statement specifically includes Borrelia among infectious causes that may need to be considered.

Should everyone with optic neuritis be tested for Lyme disease?

No. The 2026 consensus recommends infectious testing based on clinical suspicion. Lyme testing may be appropriate when exposure history, symptoms, examination findings, or other clinical features raise concern for Lyme disease.

Can Lyme disease cause blurry vision?

Yes. Blurred vision has been reported with Lyme-associated optic neuritis and other ocular manifestations. However, blurry vision has many possible causes and should not automatically be attributed to Lyme disease.

Can Lyme disease cause blindness?

Severe or permanent visual impairment appears to be uncommon, but optic neuritis can threaten vision. Sudden or progressive vision loss requires prompt medical evaluation regardless of the suspected cause.

Does optic neuritis always mean multiple sclerosis?

No. Multiple sclerosis is an important cause of optic neuritis, but NMOSD, MOGAD, autoimmune disorders, infections, and other conditions can also cause inflammation of the optic nerve.

Why does finding the cause of optic neuritis matter?

Different causes may require different treatment. The 2026 consensus notes that infectious optic neuritis requires antimicrobial treatment directed at the responsible pathogen, making recognition of a treatable infection clinically important.

Clinical Takeaway

Optic neuritis is an uncommon but recognized manifestation of Lyme disease. Most cases of optic neuritis have other explanations, particularly demyelinating and inflammatory disorders.

The important new development is that a 2026 multidisciplinary consensus statement specifically includes Borrelia among infectious causes of optic neuritis and Lyme disease among targeted infectious tests when clinically suspected.¹

For patients with an atypical presentation, compatible symptoms, or meaningful tick exposure, Lyme disease may therefore deserve consideration as part of a broader differential diagnosis rather than being assumed to be either present or absent based on the optic neuritis alone.

Finding the underlying cause matters because treatment for infectious optic neuritis may differ from treatment for primarily inflammatory or demyelinating disease.

Related Articles

Learn more about ocular and neurologic manifestations of Lyme disease:

Ocular Lyme Disease: Eye Symptoms and Vision Complications

Visual Changes in Lyme Disease: Blurred Vision, Light Sensitivity, and Visual Fatigue

Eye Problems in Lyme Disease: Can Lyme Affect Your Vision?

Lyme Disease Symptoms: Why They Come and Go

This article is for educational purposes and is not a substitute for individualized medical advice. Sudden or significant changes in vision require prompt medical evaluation.

---

SEO

SEO Title: Can Lyme Disease Cause Optic Neuritis?

Meta Description: A 2026 optic neuritis consensus includes Lyme disease among infectious causes. Learn about vision loss, symptoms, diagnosis, and treatment.

Slug: optic-neuritis-associated-with-lyme-disease

Focus Keyphrase: Lyme disease optic neuritis

Secondary Keyphrases: Lyme disease vision loss, Lyme optic neuritis, optic neuritis Lyme disease, Lyme disease blurry vision, Lyme disease eye symptoms

---

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