Retina · Patient & Surgeon Series
A layer as thin
as cling film, wrinkling
the centre of your sight.
An epiretinal membrane — a macular pucker — is a sheet of scar-like tissue that grows over the macula and slowly tightens. Often it does nothing at all. Sometimes it bends every straight line you look at. Here is what causes it, how OCT stages it, why many are only watched, and what peeling it off can realistically achieve.
Blue Mountains study
(Govetto, 2017)
visual only
Section 01 — What It Is
Nothing is missing.
Something has been added.
And it is pulling.
Most macular conditions take something away — photoreceptors in macular degeneration, tissue in a macular hole. An epiretinal membrane (ERM) does the opposite: a thin, largely transparent layer of cells and collagen forms on the inner surface of the macula. Left alone it can stay inert for years. If it contracts, it drags the retina beneath it into fine folds, thickens it, and flattens the foveal pit.
The names describe what the surgeon sees. Early, a membrane gives the macula a glinting, wet-film sheen — cellophane maculopathy. Later, a thicker, greyer sheet can pucker the retina into visible radial striae — macular pucker or preretinal macular fibrosis. They are the same disease at different intensities.
It is common and strongly age-related. In the Blue Mountains Eye Study in Australia, Mitchell and colleagues found an ERM in about 7% of people aged 49 and over, with prevalence climbing in older age groups; most were the mild cellophane form. Many people with an ERM never know they have one.
An epiretinal membrane is a thin sheet of fibrous and glial tissue that grows on the surface of the macula, usually after the vitreous gel separates from the retina with age, and sometimes after retinal tears, surgery, inflammation or vascular disease. When it contracts it wrinkles and thickens the retina, causing wavy lines, blur and size differences between the eyes, in one eye and without pain. OCT confirms it and shows how much the retina is distorted. Many membranes are mild and simply watched. When symptoms interfere with daily life, a vitrectomy with membrane peeling can relieve the traction; vision usually improves, but distortion often does not vanish completely.
Section 02 — Interactive
Watch a membrane
tighten.
On OCT, the key question is not just whether a membrane is present but what it has done to the fovea. Govetto and colleagues proposed a four-stage OCT scheme in 2017, built around the foveal pit and a feature they called ectopic inner foveal layers. Drag the slider to increase contraction and see how the schematic retina and the stage change.
Why this matters: in Govetto’s series, the more advanced stages — where a continuous band of inner retinal tissue is dragged across the centre of the fovea, and especially where the normal layers become disorganised — were associated with worse vision. That makes the stage a useful conversation tool: it helps explain why two people with “an ERM” can have very different symptoms and very different outlooks after surgery.
Section 03 — Causes
Most membranes have
no culprit. Some
have a clear one.
The majority of ERMs are idiopathic: they appear in otherwise healthy eyes, typically after a posterior vitreous detachment. As the ageing vitreous peels away, microscopic defects in the retinal surface or residual vitreous tissue left behind are thought to give glial cells a scaffold to proliferate on.
A second group are secondary membranes, which form because something else has disturbed the eye. These are worth recognising because the underlying problem may need its own management.
| Type | Typical associations | What it means in practice |
|---|---|---|
| Idiopathic | Age, posterior vitreous detachment; no other eye disease | The most common form. Often mild and slow; observation is frequently appropriate. |
| After retinal tears or detachment repair | Cells released into the vitreous from a break can settle on the macula | Can be thicker and more contractile; may appear weeks to months after repair. |
| After intraocular surgery | Reported after cataract surgery and other procedures, generally uncommon | New distortion after an otherwise successful operation deserves an OCT rather than new glasses. |
| Vascular and inflammatory | Diabetic retinopathy, retinal vein occlusion, uveitis | Swelling from the underlying disease may coexist; treating the cause matters as much as the membrane. |
| Trauma and other | Blunt injury, previous laser or cryotherapy | Managed case by case with a retina specialist. |
The course over time is usually gentle. When the Blue Mountains cohort was re-examined five years later (Fraser-Bell et al., 2003), new membranes had developed in a small proportion of people, and among existing membranes many were unchanged or had even regressed, while others progressed. That variable natural history is the main reason surgeons rarely operate on a membrane that is not bothering the patient.
Section 04 — Treatment
Watch it,
or peel it.
There is no third option yet.
No eye drop, tablet or injection reliably dissolves an established epiretinal membrane. Management therefore comes down to two paths: monitoring, or surgery. The deciding factor is usually how much the distortion interferes with the person’s life, not how the membrane looks on a scan.
For mild or asymptomatic membranes, monitoring means periodic examination and OCT, plus simple home checks with an Amsler grid or a straight edge, one eye at a time. Many people remain in this group indefinitely.
When surgery is chosen, it is a pars plana vitrectomy. The surgeon removes the vitreous gel, then grasps the edge of the membrane with very fine forceps and peels it away from the retinal surface. Because the tissue is nearly transparent, it or the underlying internal limiting membrane (ILM) is often stained with a vital dye — stains such as trypan blue, brilliant blue G or indocyanine green have all been used in vitreoretinal surgery — so it can be seen. Many surgeons also peel the ILM, which some studies associate with fewer recurrences, although practice is not uniform. The procedure is commonly performed under local anaesthesia, and unlike macular hole surgery it does not usually require a gas bubble or face-down positioning.
Section 05 — The Evidence
What surgery tends
to deliver.
Across published series, most patients gain some visual acuity after membrane peeling, and distortion usually improves. The gains are gradual, the improvement in distortion is often partial, and eyes with more advanced OCT changes before surgery tend to recover less. Cataract progression is the most predictable after-effect in eyes that still have their natural lens.
Illustrative visualisation of the direction and approximate relative magnitude reported across published series and clinical references (see References). These bars are rounded and qualitative, not pooled estimates from any single study; outcomes vary with membrane stage, cause, surgical technique and case mix.
Recovery is measured in months rather than days. Many people notice that lines look straighter within weeks, while reading acuity continues to improve for six months or more as the retina slowly relaxes and thins. A difference in image size between the eyes can also ease over the same period.
(Blue Mountains)
Govetto scheme
incidence study
Section 06 — Risk, Honestly Stated
Peeling a membrane
is delicate surgery.
Know the trade-offs.
ERM surgery is well established and most eyes do well, but it is intraocular surgery on the most important square millimetres of the retina. The benefit has to be worth the risk, which is why symptoms — not the mere presence of a membrane — drive the decision.
| Issue | What to expect |
|---|---|
| Cataract | Most eyes with their natural lens develop or progress a cataract within a year or two of vitrectomy. Combined cataract and membrane surgery is often offered to older patients for this reason. |
| Incomplete recovery | Vision improves in most eyes but may not return to normal; some residual distortion is common, particularly with advanced pre-operative OCT changes. |
| Retinal tear or detachment | An uncommon but serious risk of any vitrectomy. New floaters, flashes or a curtain-like shadow after surgery need urgent review. |
| Recurrence | Uncommon; peeling the internal limiting membrane is thought by many surgeons to reduce it. |
| Raised eye pressure, infection | Pressure spikes are usually temporary and treated with drops; infection (endophthalmitis) is rare but serious. |
Section 07 — When to Act
Cover one eye.
Look at a straight line.
Then swap.
An epiretinal membrane is rarely an emergency. But the symptom it causes — new distortion in one eye — is shared with conditions that are time-sensitive, so it deserves a prompt dilated examination and OCT.
A man in his late sixties, two years after uneventful cataract surgery in both eyes, notices that door frames look slightly bowed through his right eye and that text seems a little larger on that side. His optometrist finds good acuity but refers him for OCT, which shows an idiopathic epiretinal membrane with loss of the foveal pit and no macular hole. Because his symptoms are mild and he reads comfortably, he chooses observation with periodic scans and an Amsler grid on the fridge. When distortion begins to interfere with driving at night some time later, he opts for vitrectomy with membrane peeling; over the following months the lines straighten substantially, though not perfectly.
Seek same-day care, rather than a routine appointment, if distortion arrives together with a sudden shower of floaters, flashing lights or a shadow in the side vision — those can signal a retinal tear or detachment. Sudden central distortion with blurring in someone with macular degeneration also needs to be seen quickly.
Section 08 — FAQ
Frequently asked questions
about epiretinal membranes.
An epiretinal membrane (also called a macular pucker or cellophane maculopathy) is a thin, semi-transparent layer of fibrous and glial tissue that grows on the inner surface of the macula, the central part of the retina used for reading and fine detail. When the membrane contracts, it wrinkles and thickens the retina beneath it, which can blur and distort central vision. Many membranes are mild and cause few or no symptoms.
Mild membranes often cause no symptoms and are found on a routine eye examination or OCT scan. When symptoms occur they usually include straight lines looking wavy or bent (metamorphopsia), blurred central vision, objects appearing a different size in one eye than the other, and difficulty reading fine print. Symptoms normally affect one eye and are painless. Peripheral vision is not affected.
No. Both affect the macula and can distort vision, and both are linked to changes at the vitreous–retina interface, but they are different conditions. A macular hole is a full-thickness gap in the centre of the retina. An epiretinal membrane is an extra layer on top of the retina that wrinkles it. OCT scanning distinguishes them, and occasionally a membrane can pull the fovea into a partial-thickness (lamellar) or pseudo-hole appearance.
No. Many epiretinal membranes stay stable for years and are simply monitored, because surgery carries its own risks. Surgery is generally considered when distortion or blur interferes with daily life, such as reading or driving. Worsening OCT features can also influence the decision. The choice is individual and should be made with a retina specialist.
The usual operation is a pars plana vitrectomy with membrane peeling. The surgeon removes the vitreous gel, then uses very fine forceps to lift the membrane off the retinal surface, often after staining it or the underlying internal limiting membrane with a dye so it can be seen. Many surgeons also peel the internal limiting membrane. It is commonly done under local anaesthesia, and a gas bubble is usually not needed, although practice varies.
Most patients notice improvement, but vision often does not become completely normal. Sharpness tends to improve gradually over several months, and distortion usually lessens but may not disappear entirely. Eyes with more advanced OCT changes before surgery tend to recover less. In people who still have their natural lens, a cataract commonly develops or worsens within a year or two after vitrectomy.
References & Evidence Base
Peer-reviewed
citations.
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Epiretinal Membrane (Macular Pucker): Symptoms, OCT Stages & When Surgery Makes Sense (2026 Guide)