Epiretinal Membrane

An epiretinal membrane (also called macular pucker) is a thin layer of scar tissue that forms on the surface of the macula. It can contract and cause the retina to wrinkle, leading to blurred or distorted central vision.

At a Glance

An epiretinal membrane (ERM), also called macular pucker, is a thin layer of scar tissue that forms on the inner surface of the macula. As it contracts, it wrinkles the underlying retina, causing distortion and blur. Most common after age 50; many people with ERM have no symptoms at all.

Key Facts

Most common after age 50 Usually one eye Often stable for years

Forms

●Cellophane maculopathy — Thin, semi-transparent; minimal or no symptoms.
●Premacular fibrosis — Thicker, more opaque; causes significant wrinkling and distortion.

Common Symptoms

•Mildly blurred central vision
•Metamorphopsia — straight lines appear wavy or bent
•Monocular double vision (ghosting in one eye)
•Difficulty with fine detail tasks (reading, driving)
•Many patients: no symptoms (incidental finding)

Risk Factors / Causes

•Posterior vitreous detachment (most common trigger)
•Prior retinal tear, detachment, or laser treatment
•Eye inflammation (uveitis), prior eye surgery or trauma
•Diabetic retinopathy or retinal vein occlusion
•Age 50+ (incidence rises through the 60s–70s)

How It's Diagnosed

OCT is the primary tool — it shows the membrane as a reflective layer on the retinal surface, measures retinal thickening, and reveals loss of the normal foveal contour. Dilated fundus exam completes the picture.

Treatment Options

Observation with repeat OCT every 6–12 months if symptoms are mild. Vitrectomy with membrane peeling is offered when vision drops to ~20/50 or distortion significantly impairs daily life. Most patients see improvement within 3–6 months after surgery.

⚠ Schedule an Appointment If You Notice

•Noticeable worsening of central vision distortion
•Difficulty reading or recognizing faces
•Distortion interfering with driving or daily tasks
•New or increasing wavy lines on the Amsler grid

OCT Image Area

OCT scan area — epiretinal membrane illustration

Amsler Grid: How Distortion May Appear

Metamorphopsia—warping of straight lines—is a hallmark symptom. Cover one eye and focus on the central dot. If lines look wavy, bent, or missing, contact your retina specialist promptly.

Example of how an epiretinal membrane can warp the Amsler grid in the affected eye.

What Is an Epiretinal Membrane?

An epiretinal membrane (ERM) is a very thin, semi-transparent layer of scar-like tissue that develops on the inner surface of the retina, most often over the center of the macula. As this membrane matures, it can contract and pull on the retina beneath it, leading to wrinkling, distortion, and thickening of the delicate macular tissue.

This condition goes by several different names. You may hear it called macular pucker, which refers to the puckering or wrinkling effect it creates on the macula. It is also known as cellophane maculopathy because the membrane can look like a thin sheet of cellophane on the retinal surface, and surface wrinkling retinopathy because of the wrinkles it produces in the retina. Some doctors also use the term premacular fibrosis.

Epiretinal membranes are most commonly diagnosed in people over the age of 50. In most cases, only one eye is affected, though both eyes can develop membranes—sometimes at the same time, sometimes years apart. Many people with an ERM have no symptoms at all, and the condition is discovered during a routine eye examination.

Symptoms

Not everyone with an epiretinal membrane experiences symptoms. When symptoms do occur, they are usually mild at first and tend to worsen slowly over time as the membrane contracts. Common symptoms include:

Mild blurred vision: Fine details may look soft or out of focus, making reading and recognizing faces more difficult.
Metamorphopsia (distortion): Straight lines—such as door frames, window edges, or grid lines—may appear wavy, bent, or crooked.
Double vision in the affected eye: Some people notice a ghosting or shadow effect, where a single object appears to have a faint duplicate image.
Difficulty with depth perception: When one eye sees a distorted image and the other does not, judging distances can become challenging.
No symptoms: Many individuals have no noticeable vision changes and learn they have an ERM only during a dilated eye exam.

Risk Factors & Causes

Epiretinal membranes can develop for several reasons. In many cases, no single cause is identified, and the membrane is considered idiopathic. However, certain conditions and events are known to trigger membrane formation:

Posterior Vitreous Detachment (PVD)

The most common trigger. As the vitreous gel naturally separates from the retina with age, microscopic cells can remain on the retinal surface and proliferate into a membrane.

Retinal Tear or Detachment

A tear in the retina or a retinal detachment can release cells that settle on the macular surface and form scar tissue.

Ocular Inflammation

Inflammatory conditions inside the eye, such as uveitis, can stimulate cellular growth on the retinal surface.

Eye Surgery or Trauma

Previous intraocular surgery, cataract surgery, or physical injury to the eye can lead to secondary membrane formation.

Retinal Vascular Disease

Conditions such as diabetic retinopathy or retinal vein occlusion can predispose the eye to ERM development.

Advancing Age

The risk rises significantly after age 50, with the highest incidence occurring between the sixth and eighth decades of life.

Diagnosis

An epiretinal membrane is diagnosed during a comprehensive dilated eye examination performed by a retina specialist. The examination focuses on detecting subtle changes on the retinal surface and confirming structural changes with high-resolution imaging.

Dilated Fundus Exam

Using a slit lamp and specialized lenses, the doctor examines the macula for a glistening, cellophane-like sheen, retinal folds, or irregular blood vessel patterns that suggest a membrane is present.

Optical Coherence Tomography (OCT)

OCT is the primary diagnostic tool. This non-invasive scan captures cross-sectional images of the retina with extraordinary detail. It clearly reveals the membrane as a thin, highly reflective layer sitting on the retinal surface, measures any retinal thickening, shows loss of the normal foveal contour, and can detect associated vitreomacular traction.

Fluorescein Angiography (FA)

Occasionally used if there is suspicion of coexisting vascular disease or when the doctor needs to distinguish an ERM from other macular conditions such as choroidal neovascularization.

Treatment Options

The approach to treating an epiretinal membrane depends on how much it affects your vision and daily life. There are no eye drops, medications, or laser treatments that can dissolve or remove the membrane. Management falls into two main categories: careful observation or surgical removal.

Observation

If your symptoms are mild, your vision is still reasonably good, and the distortion is not significantly interfering with activities such as reading or driving, your doctor may recommend simply monitoring the membrane over time.

Many epiretinal membranes remain stable for years without causing progressive vision loss. During observation, you will typically be examined every 6 to 12 months with repeat OCT imaging. You should also use an Amsler grid at home to self-monitor for any new or worsening distortion.

Surgery: Vitrectomy with Membrane Peeling

Surgery is considered when vision is significantly reduced—often around 20/50 or worse—when distortion makes everyday tasks difficult, or when there is clear evidence that vision is getting worse over time.

The procedure, called pars plana vitrectomy with membrane peeling, involves removing the vitreous gel from the eye and then delicately lifting and peeling away the epiretinal membrane from the retinal surface. In many cases, the surgeon also removes the underlying internal limiting membrane (ILM) to reduce the chance of recurrence.

Special dyes such as indocyanine green or Brilliant Blue G are often used to stain the membranes, making them easier for the surgeon to see and remove completely. The surgery is typically performed as an outpatient procedure, meaning you can go home the same day.

Learn More About Retina Surgery Schedule a Consultation

Surgery Details

Understanding what happens during vitrectomy surgery can help you feel more prepared and confident if you and your doctor decide that surgical removal is the right choice.

How the Surgery Works

The surgeon makes tiny incisions in the white of the eye and uses miniature instruments to remove the vitreous gel. Once the gel is cleared, microsurgical forceps are used to grasp and peel the epiretinal membrane away from the retinal surface. If needed, the internal limiting membrane is also removed. The eye is then filled with a balanced salt solution or a temporary gas bubble to help stabilize the retina.

Anesthesia

Most vitrectomy surgeries are performed under local anesthesia with sedation, so you are comfortable and pain-free but not fully unconscious. General anesthesia is used less commonly, depending on patient preference and medical considerations.

Duration & Setting

The procedure typically takes 45 to 90 minutes. It is done in an outpatient surgical center or hospital, and you will be able to return home the same day with a patch over the operated eye.

Potential Risks & Complications

Although vitrectomy with membrane peeling is generally safe, every surgery carries some risk. Possible complications include:

Cataract progression: Very common in patients who still have their natural lens. Cataract surgery may be needed sooner than it otherwise would have been.
Retinal detachment: A small risk of the retina separating from the back of the eye after surgery.
Infection (endophthalmitis): A rare but serious infection inside the eye.
Recurrence: The membrane returns in approximately 10–20% of cases, though it may not always require additional treatment.

Recovery & Prognosis

Recovery after vitrectomy for epiretinal membrane is a gradual process. Patience is important, as visual improvement unfolds over months rather than days.

Immediate Postoperative Period

You may have a patch and shield over the eye for the first day. Mild soreness, scratchiness, and tearing are normal. Your doctor will prescribe antibiotic and anti-inflammatory eye drops. If a gas bubble was placed, you may need to maintain a specific head position for several days.

Visual Improvement

Vision improves in approximately 80–90% of patients after successful membrane peeling. However, the improvement is gradual. Many patients notice clearer vision within a few weeks, but full visual recovery commonly takes 3 to 6 months—and in some cases, even longer.

Long-Term Outlook

Most patients experience meaningful improvement in both visual acuity and distortion. That said, vision may not return to exactly what it was before the membrane developed. Some mild residual blur or waviness can persist, especially if the membrane was present for a long time before surgery.

Frequently Asked Questions

Is an epiretinal membrane the same as a macular hole?

No. An epiretinal membrane is a layer of scar tissue that forms on top of the retina and causes wrinkling, whereas a macular hole is an actual break or opening through the center of the macula. In rare cases, long-standing traction from an ERM can contribute to a partial-thickness (lamellar) macular hole, but they are distinct conditions requiring different treatments.

Will my vision return to normal after surgery?

Most people experience meaningful improvement in clarity and a noticeable reduction in distortion after vitrectomy and membrane peeling. However, complete restoration to perfectly "normal" vision is not guaranteed. The final result depends on how long the membrane was present, the baseline level of vision, and whether there has been any permanent structural damage to the photoreceptors. Some patients notice mild residual metamorphopsia even after successful surgery.

Can eye drops or laser treat an epiretinal membrane?

No. Currently, there are no eye drops, medications, or laser therapies proven to remove or reverse an established epiretinal membrane. The only definitive treatment is surgical removal through vitrectomy with membrane peeling. Observation is perfectly appropriate for many people whose symptoms are mild and stable.

What are the risks of vitrectomy and membrane peeling?

While vitrectomy is generally safe, potential risks include cataract formation or progression (very common in patients with their natural lens), retinal tear or detachment, infection inside the eye (endophthalmitis), elevated eye pressure, macular edema (swelling), and recurrence of the membrane in 10–20% of cases. Your surgeon will discuss these risks in detail and explain how they apply to your specific situation.

How do I monitor my condition at home?

Use an Amsler grid to check each eye individually on a regular basis—ideally daily or several times per week. Wear your usual reading glasses, hold the grid at a comfortable distance, cover one eye, and focus on the center dot. If you notice new waviness, dark spots, missing areas, or increasing distortion, contact your retina specialist promptly. Do not rely only on how your vision subjectively feels.

How long does it take to recover after surgery?

Most people can resume light activities within a few days to a week, but full visual recovery is a slow process. You can expect gradual improvement over 3 to 6 months, and in some cases it may take even longer for vision to reach its best level. Your doctor will guide you on when it is safe to return to work, exercise, driving, and other normal activities.

When to Seek Help

Contact your retina specialist promptly if you experience any of the following, as they may indicate progression of your epiretinal membrane or another retinal problem requiring urgent attention.

Rapidly Worsening Distortion

A sudden increase in waviness or bending of straight lines, or a noticeable jump in distortion over days to weeks.

New Floaters or Flashes

A sudden shower of floaters, flashes of light, or a curtain-like shadow in your peripheral vision may signal retinal tear or detachment.

Sudden Vision Loss

Any abrupt drop in vision, new blind spot, or significant darkening in the central or peripheral visual field requires immediate evaluation.

Related Conditions

Macular Hole

A full-thickness break in the macula, often related to vitreomacular traction. Different from ERM but can coexist or share similar risk factors.

Diabetic Retinopathy

Retinal vascular disease that can lead to diabetic macular edema and, in some cases, secondary epiretinal membrane formation.

Posterior Vitreous Detachment

The natural separation of the vitreous gel from the retina. PVD is the most common trigger for idiopathic epiretinal membrane development.

TrialFlow Patient Education

Patient Information

Date: _______________

Patient: _______________

Epiretinal Membrane (Macular Pucker)

What Is It?

An epiretinal membrane is a thin layer of scar tissue that forms on the surface of the retina, causing wrinkling and distortion of central vision. It is most common in people over 50. Many cases are mild and only require monitoring, but surgery can remove the membrane if vision is significantly affected.

Symptoms to Watch For

Mildly blurred or distorted central vision
Straight lines appearing wavy or crooked (metamorphopsia)
Difficulty reading fine print or recognizing faces
Double vision or ghosting in the affected eye
Often no symptoms at all in early stages

Treatment

Observation with periodic monitoring if symptoms are mild
Vitrectomy with membrane peeling for significant vision loss or disabling distortion
No eye drops, medications, or laser treatments are effective

⚠ Seek Immediate Help If:

Rapidly worsening vision distortion
New floaters, flashes of light, or a curtain over vision
Sudden vision loss or new blind spots
Changes noticed on home Amsler grid testing

Go to the emergency room or call your retina specialist immediately.

Follow-Up Instructions

Monitor with Amsler grid at home. See your retina specialist every 6-12 months if stable, or sooner if symptoms change. After vitrectomy surgery, vision improves gradually over 3-6 months or longer.

Doctor's Notes