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Health condition · Clinically reviewed

Epiretinal membrane, macular pucker, OCT diagnosis and vitrectomy with peel.

A cellophane-like membrane on the macula that bends straight lines and blurs the middle of vision. Slow to develop, usually treatable, and often better after keyhole surgery.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a UK-registered ophthalmologist before publication.

  • 02

    Sourced from guidance

    Checked against Royal College of Ophthalmologists, NICE and peer-reviewed retinal surgery literature.

  • 03

    Current for 2026

    Reflects modern UK vitreoretinal practice including OCT-guided assessment and phaco-vitrectomy pathways.

Key facts

Epiretinal membrane at a glance.

The essentials, in plain English. What the membrane is, who gets it, how it is diagnosed and how it is treated in the UK today.

  • What it is

    A thin, cellophane-like glial membrane growing on the surface of the macula that contracts and puckers the retina.

  • How common

    Around 5 to 10 per cent of people over 60, and more frequent with age. Often incidental on a routine eye exam.

  • Main types

    Idiopathic (80 to 90 per cent, age-related with PVD) and secondary (after vein occlusion, diabetes, uveitis, trauma or retinal repair).

  • Key symptom

    Metamorphopsia. Straight lines look wavy on the Amsler grid, with blurred central vision and occasional macropsia.

  • Gold-standard test

    Optical coherence tomography (OCT). Shows the membrane, retinal thickening and any traction with micron precision.

  • Definitive treatment

    Pars plana vitrectomy with membrane peel, often combined with ILM peel and cataract surgery in one sitting.

Why this guide matters

Watch, image, and operate only when it helps.

Not every ERM needs surgery. The three points below explain the modern UK approach and how it shapes the rest of this guide.

  • OCT changed everything

    Optical coherence tomography lets a clinician see the membrane, measure the retina and rule out a macular hole in seconds.

  • Distortion matters more than a chart line

    Metamorphopsia, contrast and reading comfort often decide the operation. Snellen acuity alone can underestimate the impact.

  • One trip to theatre where possible

    Because a cataract usually follows vitrectomy, combined phaco-vitrectomy in one sitting is increasingly the default in older eyes.

How the diagnosis is made

From first blur to a clear plan.

The steps a UK optometrist, ophthalmologist or vitreoretinal surgeon will normally follow, in order. So you know what to expect and why.

  1. 01

    Assessing

    History and visual acuity

    Onset and pattern of blur, distortion and reading difficulty. Visual acuity measured for each eye separately.

  2. 02

    Assessing

    Amsler grid check

    A quick home-style test that maps wavy lines and blind spots and gives an early read on metamorphopsia.

  3. 03

    Assessing

    Slit lamp and dilated fundoscopy

    A dilated view of the posterior segment lets the clinician see the cellophane sheen and any surface wrinkling of the macula.

  4. 04

    Confirming

    Optical coherence tomography

    OCT macular imaging is the gold standard. It quantifies retinal thickness, shows the membrane and rules out a macular hole or VMT.

  5. 05

    Confirming

    Fluorescein angiography if needed

    Selective use when leakage, ischaemia or an underlying vascular cause is suspected. Not routine for straightforward idiopathic ERM.

  6. 06

    Preparing

    Vitreoretinal referral

    For symptomatic or progressive disease, a medical retina or vitreoretinal surgeon plans monitoring or surgery.

  7. 07

    Preparing

    Pre-operative workup

    If surgery is planned, biometry for any combined cataract lens choice and a discussion of realistic visual recovery expectations.

Typical timeline: an OCT scan and specialist opinion within weeks, not months.

Symptoms

What macular pucker actually feels like.

A quiet, gradual mix of blur, distortion and reduced contrast in one eye. And the features that mean an urgent review rather than routine monitoring.

  • Blurred central vision

    A soft, gradual fog over reading and faces rather than a sudden black spot. Often first noticed one eye at a time.

  • Metamorphopsia

    Straight lines appear wavy or bent. Door frames, tiles and text lines are the classic tell on the Amsler grid.

  • Reduced visual acuity

    Variable loss, from a line or two on the chart to significant impairment when the membrane is thick and long-standing.

  • Macropsia or micropsia

    Objects seem larger or smaller in the affected eye. Comparing eyes one at a time makes it obvious.

  • Reduced contrast sensitivity

    Faces in dim light, low-contrast print and reversing at night all become harder before acuity itself drops much.

  • Gradual onset

    Weeks to months of slow change, not a sudden shower of floaters or a curtain across vision.

  • Often asymptomatic

    Many early ERMs are picked up incidentally at a routine sight test or OCT scan and simply monitored.

  • Red flag - sudden change

    A sudden increase in floaters, flashes, a curtain or a dark central spot needs same-day ophthalmology, not routine review.

Treatment

How ERM is treated in the UK.

From watchful monitoring to a pars plana vitrectomy with membrane peel, ILM peel and, where sensible, a combined cataract procedure in the same sitting.

  • Watchful monitoring

    For mild, non-progressive membranes. Regular acuity, Amsler and OCT every six to twelve months under specialist ophthalmology.

  • Pars plana vitrectomy

    The definitive procedure. A minimally invasive keyhole approach to remove the vitreous and access the macular surface.

  • Epiretinal membrane peel

    Micro-forceps are used to lift and remove the contracting membrane from the retinal surface.

  • Internal limiting membrane peel

    A deeper ILM peel is often added to reduce the risk of ERM recurrence, guided by intra-operative dyes.

  • Vital dyes

    Brilliant blue G, trypan blue or indocyanine green stain the membranes so the surgeon can see and remove them safely.

  • Combined phaco-vitrectomy

    Cataract surgery is often combined with vitrectomy because a cataract commonly develops within one to two years of vitrectomy.

  • Post-operative care

    Anti-inflammatory drops, selective posturing and gradual visual recovery over three to six months. Full restoration is not always possible.

  • Treat the underlying cause

    In secondary ERM from diabetes, vein occlusion or uveitis, the underlying disease is controlled alongside any surgical plan.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your optometrist, ophthalmologist or vitreoretinal surgeon knows your eyes and history and can tell you which parts apply to you. If in doubt, get seen.

  • Royal College of Ophthalmologists. Vitreoretinal surgery commissioning and quality standards.

  • NICE. Interventional procedures guidance on macular surgery and vitrectomy.

  • American Academy of Ophthalmology. Preferred Practice Pattern - Idiopathic Epiretinal Membrane and Vitreomacular Traction.

  • Peer-reviewed literature on OCT-guided ERM assessment and combined phaco-vitrectomy outcomes.

Red flags

When distortion needs urgent attention.

Most ERMs are safely watched or planned in clinic. These are the situations that are not, and where an emergency eye service should see you the same day.

  • Sudden vision loss

    A rapid drop in central or peripheral vision needs urgent same-day ophthalmology review to exclude detachment or vascular events.

  • New flashes and floaters

    A sudden shower of floaters or persistent flashing lights can signal a retinal tear or detachment and needs urgent assessment.

  • Curtain or shadow across vision

    A dark curtain progressing from the periphery is a classic warning of retinal detachment. Attend an eye casualty the same day.

  • Rapid progression of distortion

    Metamorphopsia worsening over days rather than months warrants sooner review to consider urgent surgery.

  • Post-operative pain or redness

    Increasing pain, redness or vision loss after vitrectomy raises the possibility of endophthalmitis. Contact the surgical team the same day.

  • Central dark spot

    A defined central scotoma may indicate a macular hole. OCT differentiates a hole from a puckered but intact macula.

  • Diabetic or uveitic eye

    Any new distortion in a diabetic or uveitic eye needs sooner review to look for macular oedema alongside the membrane.

  • Trauma or recent surgery

    A recent eye injury or intraocular surgery followed by new distortion suggests a secondary ERM that may progress faster.

  • One-eyed patient

    When the affected eye is the only useful eye, thresholds for intervention and monitoring are lower.

Living with it

A treatable condition, with a clear ladder.

Four practical habits that make the biggest difference day to day. Home checks, realistic recovery expectations, sensible lighting and knowing where to turn for support.

A quiet reminder

Distortion often settles before the chart line does.

After a peel, wavy lines usually straighten first, then reading and acuity catch up gradually over three to six months.

  1. 01 Monitor

    Amsler grid at home

    A quick weekly check of straight lines picks up subtle progression sooner than waiting for the next appointment.

  2. 02 Expect

    Recovery is gradual

    After surgery vision improves over three to six months. Distortion often settles first, then acuity, and full restoration is not guaranteed.

  3. 03 Adapt

    Lighting and contrast

    Bright, even task lighting and high-contrast print help most day-to-day tasks while the eye is under observation or recovering.

  4. 04 Support

    Practical and emotional help

    The Macular Society and RNIB offer support, low-vision aids and information. Ask early rather than waiting for a crisis.

Frequently asked

Everything we get asked about macular pucker.

Quick answers on OCT, when to operate, what vitrectomy involves and what to expect afterwards.

  • What is an epiretinal membrane?

    A thin, cellophane-like sheet of glial cells that grows on the surface of the macula and contracts. Also called macular pucker, cellophane maculopathy or surface wrinkling retinopathy, it distorts the retina and causes blurred, wavy central vision.

  • What causes it?

    Most cases are idiopathic and linked to age and posterior vitreous detachment, where glial cells escape through small defects in the internal limiting membrane and proliferate on the retina. Secondary causes include retinal vein occlusion, diabetic retinopathy, uveitis, trauma and previous retinal surgery.

  • How is it diagnosed?

    Through a dilated eye exam, visual acuity check, an Amsler grid and, most importantly, optical coherence tomography. OCT is the gold standard because it shows the membrane, retinal thickening and any traction, and rules out a macular hole or vitreomacular traction.

  • Does every epiretinal membrane need surgery?

    No. Mild, non-progressive membranes with good vision are usually just monitored every six to twelve months. Surgery is considered when metamorphopsia is significant, visual acuity has dropped or progression is documented on OCT.

  • What does surgery involve?

    A pars plana vitrectomy removes the vitreous gel, the membrane is peeled off with micro-forceps and an internal limiting membrane peel is often added to reduce recurrence. It is usually a day case under local or general anaesthetic, sometimes combined with cataract surgery.

  • What can I expect after vitrectomy?

    Anti-inflammatory drops for several weeks and gradual visual recovery over three to six months. Distortion tends to improve first, then acuity. A cataract commonly develops within one to two years of vitrectomy if not already removed, which is why combined phaco-vitrectomy is often offered.

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