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What Is an Epiretinal Membrane (ERM)?

An epiretinal membrane (ERM), also called a macular pucker, is a thin layer of fibrous scar tissue that forms on the surface of the retina. The membrane can contract and wrinkle the underlying retina, particularly the macula, leading to distorted or blurred central vision. ERMs typically develop in people over 50 and are most common in those over 75. They may be associated with retinal diseases or injuries but sometimes occur without a known cause.

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What Is an Epiretinal Membrane (ERM)?

An epiretinal membrane (ERM), also called a macular pucker, is a thin layer of fibrous scar tissue that forms on the surface of the retina. The membrane can contract and wrinkle the underlying retina, particularly the macula, leading to distorted or blurred central vision. ERMs typically develop in people over 50 and are most common in those over 75. They may be associated with retinal diseases or injuries but sometimes occur without a known cause.

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What Causes Epiretinal Membrane?

ERMs can form after retinal conditions such as diabetic retinopathy, retinal detachment or tear, inflammation like uveitis or trauma. Scar tissue develops on the retinal surface and shrinks, causing wrinkling. Sometimes no cause is identified. Age is a major risk factor, and ERMs are more common in adults over 50.

Symptoms of ERM

Symptoms include blurred or distorted central vision, difficulty reading or seeing fine details and straight lines appearing wavy. Peripheral vision is usually unaffected. Some people have no symptoms and discover the membrane during a routine exam.

Diagnosis and Monitoring

Diagnosis involves a dilated eye exam and imaging tests such as optical coherence tomography (OCT), fluorescein angiography or retinal photography to visualize the membrane. Doctors monitor mild cases over time to see if vision worsens.

Treatment Options

Most ERMs do not require treatment. If vision distortion is significant, surgery called a vitrectomy with membrane peeling can improve vision. Surgery is generally safe but may increase the risk of cataracts. Discuss risks and benefits with your ophthalmologist.

Frequently Asked Questions

Do ERMs cause blindness?

ERMs usually cause mild to moderate vision distortion rather than complete blindness. Severe untreated cases can impair central vision, but surgery often improves vision.

Who is at risk for ERM?

People over 50, especially those with a history of retinal disease, diabetic retinopathy, retinal detachment, uveitis or eye trauma, are at higher risk. However, ERMs can occur without a known cause.

What happens during ERM surgery?

Surgery is performed under anesthesia. The surgeon removes the vitreous gel and peels the membrane from the retina. Recovery takes several weeks, and vision gradually improves.

Can ERMs recur?

Recurrence after surgery is uncommon but possible. Your ophthalmologist will monitor your eye and discuss follow-up care. Maintaining regular eye exams helps detect any changes early.