Multiple Evanescent White Dot Syndrome: Symptoms, Causes, Diagnosis and Treatment

Written by Medicover Team and Medically Reviewed by Dr Manaswini Priya Varanasi , Ophthalmologists

Multiple Evanescent White Dot Syndrome (MEWDS) is a rare inflammatory eye condition that primarily affects the retina, usually in one eye. It most commonly occurs in young adults, particularly women, and often causes sudden vision changes. Although the exact cause is unknown, most people recover well with appropriate monitoring and supportive care.

What are the Different Types of Multiple Evanescent White Dot Syndrome?

MEWDS is generally considered a single clinical condition rather than a disease with established subtypes. However, it belongs to a group of inflammatory white dot syndromes that share similar retinal findings and may require differentiation during diagnosis.

• Multiple Evanescent White Dot Syndrome (MEWDS): Characterized by multiple transient white retinal spots, sudden vision changes, and spontaneous recovery in most cases.
• Acute Posterior Multifocal Placoid Pigment Epitheliopathy (APMPPE): An inflammatory retinal disorder that may resemble MEWDS but often affects both eyes.
• Acute Zonal Occult Outer Retinopathy (AZOOR): Causes dysfunction of the outer retina with progressive visual field loss.
• Multifocal Choroiditis with Panuveitis (MCP): An inflammatory condition associated with choroidal lesions, floaters, and reduced vision.
• Persistent Placoid Maculopathy: A rare retinal inflammatory disorder with persistent placoid lesions and prolonged visual impairment.

What are the Symptoms of Multiple Evanescent White Dot Syndrome?

Multiple Evanescent White Dot Syndrome usually presents with sudden visual changes in one eye. Symptoms often improve gradually over several weeks.

Common Symptoms

• Blurred vision.
• Floaters.
• Photopsia (flashes of light).
• Visual field defects.
• Scotoma (blind spot).
• Mild eye discomfort.
• Sensitivity to light.
• Redness of the affected eye.

What Causes Multiple Evanescent White Dot Syndrome?

The exact cause of MEWDS remains unknown, but it is thought to result from an inflammatory or autoimmune response affecting the retina.

Possible Causes

• Recent viral infections.
• Autoimmune responses.
• Genetic susceptibility.
• Environmental triggers.
• Unknown factors.

When should you see a doctor for Multiple Evanescent White Dot Syndrome?

Seek prompt medical evaluation if you experience sudden vision changes or other symptoms affecting one or both eyes. Early diagnosis helps rule out serious retinal conditions and ensures appropriate management.

You may be treated by an Ophthalmologist, Retina Specialist, or another eye care specialist depending on your condition.

• Sudden blurred vision.
• New floaters or flashes of light.
• Blind spots or visual field loss.
• Persistent eye discomfort or redness.
• Symptoms that worsen or do not improve.

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How is Multiple Evanescent White Dot Syndrome Diagnosed?

Diagnosis is based on a comprehensive eye examination and retinal imaging to identify the characteristic white retinal lesions and exclude other inflammatory eye diseases.

Diagnostic Tests

• Comprehensive eye examination.
• Ophthalmoscopy.
• Fluorescein angiography.
• Optical coherence tomography (OCT).
• Fundus autofluorescence imaging.
• Visual field testing.

What are the Treatment Options for Multiple Evanescent White Dot Syndrome?

Most cases of MEWDS resolve spontaneously without specific treatment. Management focuses on monitoring recovery and treating inflammation when necessary.

Treatment Options

• Observation: Most patients recover without intervention.
• Corticosteroids: May be considered for significant inflammation or persistent symptoms.
• Nonsteroidal anti-inflammatory drugs (NSAIDs): Occasionally used for symptom relief.
• Immunosuppressive therapy: Rarely required for severe or recurrent inflammatory disease.
• Regular follow-up eye examinations to monitor recovery.

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What are the Risk Factors for Multiple Evanescent White Dot Syndrome?

Several factors are associated with an increased likelihood of developing MEWDS.

• Young adulthood.
• Female sex.
• Recent viral illness.
• Autoimmune disorders.
• Genetic predisposition.

What are the Complications of Multiple Evanescent White Dot Syndrome?

Although most individuals recover completely, some may experience complications.

• Persistent blind spots.
• Residual visual field defects.
• Recurrence of retinal inflammation (uncommon).
• Permanent vision impairment in rare cases.

How can Multiple Evanescent White Dot Syndrome be Prevented?

There is no proven way to prevent MEWDS. However, maintaining good eye health, treating infections promptly, and managing underlying autoimmune conditions may support overall retinal health.

What is the Recovery Process for Multiple Evanescent White Dot Syndrome?

Most people recover within 6 to 12 weeks, although regular follow-up is important to monitor healing and detect rare recurrences.

• Routine follow-up eye examinations.
• Monitoring of vision and retinal findings.
• Managing underlying autoimmune or viral conditions if present.
• Avoiding unnecessary eye strain and following medical advice.

What is the Prognosis for Multiple Evanescent White Dot Syndrome?

The prognosis is generally excellent. Most individuals regain normal or near-normal vision without permanent damage, although mild visual field defects may persist in a small number of cases.

How can you live with Multiple Evanescent White Dot Syndrome?

Living with MEWDS involves attending scheduled eye examinations, reporting any new visual symptoms promptly, and following your ophthalmologist's recommendations. Most people are able to return to their normal daily activities once vision improves.