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Epiretinal Membrane: Causes, Symptoms, and Treatment
Who Is at Risk for an Epiretinal Membrane?
Epiretinal membranes are more common than many people realize, and certain factors can increase the likelihood of developing one. Age is the most significant factor, though medical history and eye conditions also play a role.
ERMs become significantly more common with age. They are estimated to affect a notable portion of adults over 50, and prevalence increases considerably in people over 75. Despite how frequently they occur, the majority of ERMs are mild and never require treatment.
Research has also shown differences in ERM rates across ethnic groups, with higher prevalence observed in Chinese populations compared to Hispanic, white, and Black populations. These differences suggest that genetic or anatomical factors may contribute to who develops the condition.
Certain health conditions are associated with a higher risk of developing an ERM. Diabetes and high cholesterol have both been linked to increased rates of epiretinal membrane formation.
On the eye health side, any condition or event that causes inflammation or disruption to the retinal surface raises the risk. A history of retinal tears, retinal detachment, uveitis, retinal vein occlusion, or prior eye surgery are all relevant risk factors that a Retina Specialist will ask about during an evaluation.
Symptoms of an Epiretinal Membrane
Many people with an ERM have no symptoms, particularly in the early stages. When symptoms do appear, they tend to develop slowly and affect central vision rather than side vision.
The most frequently reported symptoms include blurred central vision, difficulty reading or seeing fine detail, and a sense that vision appears hazy or foggy. Some people notice a gray or cloudy area in the center of their vision.
Symptoms most often affect one eye, though it is possible for ERMs to develop in both eyes at different times and with varying degrees of severity.
One of the most distinctive symptoms of an epiretinal membrane is metamorphopsia, a term for visual distortion. People with this symptom may notice that straight lines such as door frames, text on a page, or telephone poles appear wavy, bent, or crooked.
This distortion occurs because the contracting membrane is pulling on the macula and disrupting its normally flat surface. The degree of distortion can range from barely noticeable to significant enough to interfere with reading, driving, or recognizing faces.
It is equally important to understand what epiretinal membranes do not cause. ERMs are painless and do not affect peripheral vision. They also do not lead to total blindness in the affected eye.
Understanding these limits can help reduce unnecessary anxiety while still recognizing when changes in central vision deserve professional evaluation.
How We Diagnose an Epiretinal Membrane
An accurate diagnosis begins with a thorough examination and is confirmed with advanced imaging. Our Retina Specialists use multiple tools to evaluate the extent of the membrane and guide treatment decisions.
An epiretinal membrane is often first detected during a dilated eye exam. Drops are placed in the eye to widen the pupil, and a Retina Specialist uses a special lens and light to examine the retina directly. In mild cases, the membrane may appear as a subtle, glistening layer on the macula. In more advanced cases, it may appear thicker and more opaque.
Optical coherence tomography, or OCT, is the most important tool for evaluating an ERM. OCT uses light waves to produce highly detailed cross-sectional images of the retina, similar to an ultrasound but with much greater resolution. The scan is painless, takes only a few minutes, and does not require any injections.
OCT allows a Retina Specialist to measure retinal thickness, see whether the membrane is causing wrinkling or swelling, identify specific structural changes within the retinal layers, and track any changes over time. Staging systems based on OCT findings help guide decisions about when and whether to recommend surgery.
An Amsler grid is a simple home-monitoring tool that looks like a sheet of graph paper with a dot in the center. Checking it daily, one eye at a time, can help detect new distortion or blurring between appointments. A Retina Specialist may recommend using this grid regularly if your ERM is being watched over time rather than treated immediately.
Treatment Options for an Epiretinal Membrane
Treatment depends on how much the membrane is affecting vision and whether symptoms are interfering with daily life. Options range from careful observation to a surgical procedure to remove the membrane.
Most ERMs are mild and stable, and for many patients, observation is the appropriate approach. Because most membranes reach a certain point and stop progressing, a Retina Specialist may recommend periodic eye exams and OCT scans to track any changes without intervening right away.
It is important to know that there are no eye drops, medications, or supplements that can dissolve or remove an epiretinal membrane. Surgery is the only effective treatment when the membrane does need to be addressed.
When an ERM causes significant vision loss or distortion that interferes with daily activities, a surgical procedure called a vitrectomy (surgery to remove the gel inside the eye) with membrane peeling is the standard treatment. During this procedure, a Retina Specialist makes tiny incisions in the eye, removes the vitreous gel, and carefully peels the membrane away from the retinal surface.
Removing the membrane allows the macula to gradually flatten and return closer to its normal shape. Advanced intraoperative imaging techniques can be used during surgery to guide membrane peeling with greater precision, improving outcomes and reducing the chance of the membrane growing back.
The right time to consider surgery is different for every patient. Research has shown that patients who are monitored for several months before surgery can achieve visual improvements comparable to those who had surgery sooner, supporting a careful, individualized approach for milder cases.
At the same time, waiting too long when vision is declining can make recovery more challenging. A Retina Specialist will weigh the degree of vision loss, the severity of distortion, OCT findings, and the impact on daily activities when recommending whether and when to proceed with surgery.
What to Expect Before, During, and After Surgery
For patients who are candidates for vitrectomy, knowing what to expect at each stage can make the experience less stressful. The procedure is performed as an outpatient surgery, meaning you go home the same day.
A Retina Specialist will perform a thorough eye examination and OCT imaging before surgery. You will receive specific instructions about any medications and guidelines for eating or drinking beforehand. Most vitrectomies are performed under local anesthesia with sedation, so you remain awake but comfortable throughout the procedure.
The surgery typically takes about one to two hours. After the vitreous gel and membrane are removed, the eye is filled with a balanced salt solution that the eye naturally replaces on its own. In some cases, a small gas bubble is used to help the retina heal properly. If a gas bubble is placed, you may need to maintain a specific head position for a period of time and avoid air travel until the bubble absorbs completely.
Recovery varies from person to person. Vision improvement is typically gradual, occurring over weeks to months. The eye may be red, tender, or sensitive to light in the first few days. Prescription eye drops are used after surgery to prevent infection and reduce inflammation during healing.
Vitrectomy is a well-established procedure with a strong safety record, but all surgeries carry some degree of risk. The most common side effect is an accelerated development of cataracts in the months following the procedure. Less common but serious risks include retinal detachment, infection inside the eye, bleeding, elevated eye pressure, and recurrence of the membrane.
A Retina Specialist will review these risks with you in detail and help you weigh them against the potential benefit of improved vision before recommending surgery.
Living With an Epiretinal Membrane
Whether you are being monitored or have already had surgery, ongoing awareness and regular follow-up are key to protecting your vision over the long term.
If your ERM is being observed rather than treated, checking an Amsler grid daily is a simple and effective habit. Cover one eye at a time, look at the center dot from a consistent distance in good lighting, and note any areas that appear wavy, blurred, or missing. Contact your Retina Specialist promptly if you notice any new changes.
Even when the membrane appears stable, periodic OCT scans at scheduled appointments can detect subtle changes that may not be obvious in everyday vision.
For those with noticeable distortion, several practical strategies can make daily tasks easier. Using brighter lighting for reading and close work, increasing font sizes on digital screens, and using magnifying devices can all improve comfort. If only one eye is affected, favoring the clearer eye for detailed tasks may also help.
It is entirely normal to feel concerned about changes in vision. Talking openly with a Retina Specialist about what to expect and how to adapt can provide both reassurance and practical direction.
The long-term prognosis for most people with epiretinal membranes is generally favorable. Many ERMs remain mild and stable throughout a person's life without ever requiring surgery. For those who do need the procedure, vitrectomy with membrane peeling has a well-established track record of improving vision and reducing distortion, with continued improvement often occurring over several months after surgery.
The degree of recovery depends on factors such as how long the membrane was present, how much traction it placed on the retina, and the extent of structural changes before surgery. Regular follow-up after surgery helps detect any recurrence early, when it is most manageable.
When to Seek Care
Knowing when to call your eye doctor, and when to act urgently, is an important part of protecting your vision if you have or suspect an epiretinal membrane.
Schedule an appointment with a Retina Specialist if you notice new or worsening blurring in your central vision, difficulty reading or recognizing faces, or if straight lines begin to appear wavy or bent. Even mild or gradual changes deserve attention so that a baseline can be established and any progression can be tracked.
Some eye symptoms are urgent and should not wait for a routine appointment. Seek immediate care if you experience a sudden increase in floaters, flashes of light, a curtain or shadow appearing across any part of your vision, or sudden vision loss in one eye.
These symptoms can indicate a retinal tear or detachment, which is a separate and serious condition requiring prompt treatment. An epiretinal membrane itself does not cause these symptoms, so their sudden appearance is a signal that something else may be occurring.
Frequently Asked Questions
These answers address common questions and practical concerns that go beyond the general information covered above.
In rare situations, an ERM may separate from the retinal surface on its own if the vitreous gel continues to pull away during a posterior vitreous detachment. This does happen occasionally, but it is uncommon. For the vast majority of patients, a membrane that is visible on examination tends to remain in place. This is why regular monitoring is recommended even when surgery is not needed, so that any meaningful changes can be caught early.
No. The majority of people diagnosed with an epiretinal membrane never require surgery. Most ERMs are mild, stable, and cause only minimal symptoms that do not significantly affect daily life. Surgery is generally considered only when distortion or vision loss begins to interfere with everyday tasks such as reading, driving, or working. Your Retina Specialist will help you weigh the impact on your daily activities against the risks and expected benefits of the procedure.
Improvement after vitrectomy with membrane peeling is gradual and varies from person to person. Some patients begin to notice changes within a few weeks, while others may take three to six months or longer to experience the full benefit. The extent of recovery depends on how long the membrane was present, how much it distorted the retinal layers, and whether structural changes had already occurred in the macula. Your Retina Specialist will monitor your progress with follow-up exams and OCT scans throughout the recovery period.
It is possible for an epiretinal membrane to develop in both eyes, but this does not happen in every case. Many people experience an ERM in only one eye throughout their lifetime. When both eyes are affected, the membranes often develop at different times and may differ in severity. Each eye is evaluated and managed separately based on its own findings and how much it is affecting your vision.
There is currently no proven way to prevent an idiopathic ERM from forming, since the most common cause is the natural aging process. However, if you have an underlying condition that raises your risk, such as diabetes, keeping it well controlled may help reduce the chance of developing a secondary ERM. Maintaining regular comprehensive eye exams is the most effective strategy for early detection, which allows for timely monitoring and appropriate care if a membrane does develop.
Schedule a Retina Consultation at The Eye Center
If you are experiencing changes in your central vision or have been told you may have an epiretinal membrane, our visiting Retina Specialists at The Eye Center are here to help. Serving patients across Northern Virginia, we offer advanced retinal imaging and a full range of treatment options in a compassionate, patient-focused setting. We welcome you to schedule a consultation and take the next step toward protecting your vision.