What to Expect With an Epiretinal Membrane Peel

An epiretinal membrane peel is a same-day surgical procedure performed under local anesthesia, typically lasting under an hour, with most people going home within a few hours of arriving. Vision usually improves over weeks to months, though the degree of improvement depends heavily on how much the membrane distorted the retina before surgery. The procedure is well-studied, with generally favorable outcomes, but it comes with trade-offs worth understanding before you agree to a surgical date.

Why the Membrane Forms in the First Place

An epiretinal membrane is a thin sheet of scar-like tissue that grows across the surface of the macula, the part of your retina responsible for sharp central vision. Most cases are “idiopathic,” meaning they arise on their own without any obvious eye disease. The leading explanation points to the vitreous gel that fills the eye: as it naturally separates from the retina with age, it can leave behind remnants of its outer layer on the retinal surface, and those remnants serve as scaffolding for cells to proliferate into a membrane.¹ This is why epiretinal membranes become more common after middle age.

Some membranes develop secondarily, after retinal tears, inflammation, prior eye surgery, or conditions like diabetic retinopathy. The distinction matters: secondary membranes tend to respond well to surgery in terms of visual improvement, but they also recur more frequently. One study found a recurrence rate within one year of about 5% for idiopathic membranes versus 20% for secondary ones.²

How Surgeons Decide When to Operate

Not every epiretinal membrane needs surgery. Many are mild, cause little or no distortion, and can be monitored for years. The decision to operate hinges on how much the membrane is affecting your vision and daily life, not just on the fact that it exists. Your retina specialist will use optical coherence tomography (OCT), a painless imaging scan, to see exactly how the membrane is pulling on your retinal layers.

A staging system based on OCT findings divides membranes into four categories of increasing severity. At the mildest stage, the membrane is thin and the foveal pit (the natural depression at the center of the macula) is still intact. At the most severe stage, the membrane is thick, abnormal tissue layers have grown across the fovea, and the normal retinal architecture is disrupted. Vision declines progressively across these stages.³ The practical takeaway: earlier-stage membranes with preserved retinal structure tend to have better surgical outcomes, which is why your surgeon might recommend surgery before your vision drops to a level that feels obviously “bad.”

There is an ongoing debate about whether to operate on eyes that still have reasonably good vision. A study of 140 eyes with preoperative vision around 20/40 found a statistically significant improvement to about 20/35 at one year.⁴ That is a real but modest gain on the eye chart. The bigger benefit for people in this group is often the reduction of metamorphopsia, the wavy distortion of straight lines that epiretinal membranes cause. A single Snellen acuity number does not capture how annoying it is to see door frames curve or faces look warped.

What Happens During the Procedure

The surgery is a pars plana vitrectomy, which means the surgeon enters the eye through tiny incisions (ports) placed in the pars plana, a zone behind the iris where entry is safe. Modern instruments are 25-gauge or 23-gauge, meaning the incisions are about half a millimeter wide and usually self-sealing without stitches.⁴ Three ports go in: one for a light source, one for an infusion line that keeps the eye pressurized with saline, and one for surgical instruments.

The surgeon first removes some or all of the vitreous gel, then uses fine forceps to grasp the edge of the epiretinal membrane and gently peel it away from the retinal surface. To see the membrane more clearly, dyes are often applied to stain it. Several dyes are in use, and the choice varies by surgeon. Brilliant blue G and trypan blue have shown favorable safety profiles. In one comparative study, brilliant blue G was the most convenient to use and produced outcomes comparable to the older dye indocyanine green, while patients in the indocyanine green group had a notably higher rate of visual decline (40%, compared with about 5-7% in the other groups).⁵ Newer dual-purpose dyes have also emerged, and early results suggest they are safe and effective for staining both the membrane and the internal limiting membrane beneath it.⁶

Some surgeons now use intraoperative OCT, which provides real-time cross-sectional images of the retina during the procedure. This technology helps identify safer starting points for peeling and confirms whether the membrane has been fully removed. It has proven particularly useful in highly nearsighted eyes, where the retina may be thinner and more vulnerable to developing a macular hole during peeling.⁷

Should the Inner Limiting Membrane Be Peeled Too?

Beneath the epiretinal membrane sits the inner limiting membrane (ILM), a thin natural layer of the retina itself. Whether to peel this layer along with the epiretinal membrane is one of the most debated questions in retinal surgery. The argument for removing it: it may contain residual cells that could regrow into a new membrane. The argument against: it is a normal part of the retina, and removing it might cause subtle damage.

The evidence on visual outcomes is clear and consistent. Two separate meta-analyses found no meaningful difference in final visual acuity between eyes that had ILM peeling and those that did not.⁸ ⁹ Where ILM peeling does make a difference is in recurrence. The larger meta-analysis, covering 19 studies and nearly 1,300 eyes, found that peeling the ILM reduced recurrence risk by roughly 75% and significantly lowered the need for additional surgery.⁹

There is a trade-off: ILM peeling was associated with slightly greater macular thickness at twelve months, suggesting some mild swelling that does not seem to harm vision but does reflect a structural difference.⁸ Many surgeons now peel the ILM routinely, reasoning that the recurrence benefit outweighs a small and clinically inconsequential increase in macular thickness. If your surgeon chooses not to peel it, that is also a reasonable decision backed by data showing equivalent visual results.

Anesthesia and What the Day Feels Like

Most epiretinal membrane peels are done under local or regional anesthesia rather than general anesthesia. You are awake but your eye is numbed. A systematic review and network analysis comparing different techniques found that a sub-Tenon injection (a numbing agent placed under the tissue covering the eye) provided the best pain control during surgery and was least likely to require additional anesthesia mid-procedure. Topical anesthesia alone, essentially just numbing drops, was significantly less effective for pain control.¹⁰

You will typically arrive at the surgical center a couple of hours before the procedure for dilating drops, consent paperwork, and the anesthetic injection. During the surgery itself, you might see lights or movement, but you should not feel pain. Most people describe pressure or mild discomfort at worst. The whole procedure usually runs between 30 and 60 minutes, though this varies. Afterward, you will have a patch on the eye and someone needs to drive you home.

The First Days and Weeks After Surgery

Expect your vision to be blurry right away. The eye will be red, and you may feel a gritty or mildly sore sensation for the first few days. Your surgeon will prescribe eye drops, typically an antibiotic to prevent infection and a steroid to control inflammation. Some centers have moved toward “dropless” approaches, injecting a combination of antibiotic and steroid directly into the eye at the end of surgery. A study comparing this approach to traditional drop regimens found similar outcomes with no increased risk of elevated eye pressure.¹¹

Unlike macular hole surgery, epiretinal membrane peeling does not usually require face-down positioning afterward. If your surgeon used a gas bubble inside the eye (which is not always necessary for membrane peels), you may need to avoid certain head positions for a period, and you cannot fly until the gas absorbs. Most people return to light daily activities within a few days, though you should avoid heavy lifting and strenuous exercise for a couple of weeks.

How Much Vision Will You Recover?

This is the question everyone asks, and the honest answer is: it varies widely. Vision tends to improve gradually over three to six months, with some people continuing to notice subtle gains up to a year or more after surgery.

For primary (idiopathic) epiretinal membranes, about 57% of eyes maintained vision better than their preoperative level at long-term follow-up, compared with only 33% of eyes with secondary membranes.¹² Importantly, visual acuity on an eye chart does not tell the whole story. Studies measuring reading ability and central retinal sensitivity found improvement in both after membrane peel surgery, even in cases where the eye-chart gains were modest. Maximum reading speed was generally good before surgery and stayed good afterward.¹³

The outcomes you should not expect: perfect 20/20 vision is not guaranteed, and in roughly 15% of cases, visual acuity actually worsens after surgery. Another 15% or so see no change at all. About 5% of epiretinal membranes recur following surgery.¹⁴ These numbers are averages across large populations. Your own odds are shaped by factors including how long the membrane has been there, how severely it distorted the retinal layers, and whether the cause was idiopathic or secondary.

Cataract Formation After Vitrectomy

If you still have your natural lens, this is perhaps the most predictable consequence of the surgery. Cataract formation after vitrectomy is nearly universal in people over 50, with rates approaching 100% within two years. The mechanism involves changes in oxygen levels within the eye once the vitreous gel is removed, which accelerates lens clouding, plus potential direct trauma to the lens during surgery and inflammation from postoperative drops.¹⁵

This is not a disaster. It just means you should plan on cataract surgery down the road if you have not already had it. Some surgeons address this proactively by combining the membrane peel with cataract removal in a single session, especially for older patients or those with any pre-existing lens cloudiness. If you are younger, your surgeon might opt to do the vitrectomy alone and address the cataract later only if it becomes visually significant. Either way, it is worth discussing before the day of surgery so you are not caught off guard when your lens starts to cloud over in the months that follow.

Complications Beyond Cataracts

Serious complications from epiretinal membrane surgery are uncommon but real. Documented complications include bleeding during surgery, retinal tears (which can sometimes lead to retinal detachment), macular swelling after surgery, and changes to the pigment layer beneath the retina.¹⁶ Retinal detachment is the most feared outcome and the reason your surgeon will ask you to report any sudden increase in floaters, flashes of light, or a shadow creeping across your vision in the weeks after surgery.

Macular edema, or swelling of the central retina, is another recognized postoperative issue. In one study, it occurred in roughly 13-22% of patients regardless of whether the ILM was peeled, and the difference between the two groups was not statistically significant.¹⁷ Most cases of postoperative macular edema resolve with anti-inflammatory drops or injections, but persistent swelling can limit the final visual outcome.

Elevated eye pressure after surgery is another possibility, particularly if steroids are used (either as drops or injected into the eye). This is usually manageable by adjusting or stopping the steroid, though it requires monitoring at follow-up visits.

What Changes in Your Vision Afterward May Feel Like

Even when the surgery is a clear success on paper, adjusting to the operated eye can feel strange. Some people notice that the image from the operated eye is a slightly different size or shape than the image from the other eye, especially if the membrane had been distorting vision for a long time. Your brain adapted to the distortion, and removing it creates a new mismatch that takes time to resolve. Metamorphopsia often improves but does not always disappear completely. Research using three-dimensional displacement mapping has shown that the retinal surface physically shifts after membrane removal, and the degree of this shift correlates with the amount of preoperative distortion.¹⁸

Contrast sensitivity, the ability to distinguish objects against similarly colored backgrounds, also tends to improve but can take longer than standard visual acuity. If you find that you can read the eye chart better but still struggle with driving at dusk or reading in dim light, that is a normal part of the recovery arc. Patience matters here, because the retinal layers are literally remodeling over months as they settle into their new, unbuckled position.

When the Membrane Comes Back

Recurrence after surgery is uncommon but not rare. The overall rate sits around 5% for idiopathic membranes, though it climbs substantially for secondary membranes, where one study reported 20% recurrence within a year.² Peeling the ILM at the time of the original surgery significantly reduces this risk. If a membrane does recur, a second surgery is possible, though the visual gains from re-operation tend to be more modest than from the first procedure.

You should also know that having an epiretinal membrane in one eye increases the likelihood of developing one in the other eye over time, since the same age-related vitreous changes happen in both eyes. This does not mean your other eye will definitely need surgery, but it is worth mentioning at future eye exams so your doctor can keep an eye on it, so to speak.

The Practical Timeline

Pulling all of this together into a rough calendar: you will have several preoperative visits for imaging and measurements. The surgery itself takes up a morning or afternoon. The first postoperative check is usually the next day, with additional visits at one week, one month, three months, and six months. Steroid and antibiotic drops typically taper over four to six weeks.

Vision starts clearing in the first few weeks but continues to evolve for months. Many people feel comfortable returning to work within one to two weeks, though this depends on the visual demands of your job. Driving is off the table until your surgeon confirms adequate vision, which is often at the one- to two-week mark but varies. If a gas bubble was used, you will need to wait until it fully absorbs before flying, scuba diving, or undergoing any procedure requiring nitrous oxide anesthesia. Most people describe the overall experience as far less dramatic than they feared beforehand, with the waiting and uncertainty in the months of visual recovery being harder than the surgery itself.

1
American Journal of Ophthalmology. Posterior Vitreous Detachment: Evolution and Complications of Its Early Stages
2
PubMed. Surgical results of idiopathic and secondary epiretinal membrane
3
PubMed. Insights Into Epiretinal Membranes: Presence of Ectopic Inner Foveal Layers and a New Optical Coherence Tomography Staging Scheme
4
Retina. Surgical Outcomes in Patients with Macular Pucker and Good Preoperative Visual Acuity after Vitrectomy with Membrane Peeling
5
Retina. A Comparison of Brilliant Blue G, Trypan Blue, and Indocyanine Green Dyes to Assist Internal Limiting Membrane Peeling During Macular Hole Surgery
6
Scientific Reports. Evaluation of efficacy and safety of new high-density dyes for chromovitrectomy
7
PubMed Central. The State of Intraoperative OCT in Vitreoretinal Surgery: Recent Advances and Future Challenges
8
PubMed. Effects of Internal Limiting Membrane Peel for Idiopathic Epiretinal Membrane Surgery: A Systematic Review of Randomized Controlled Trials
9
PubMed. Pars Plana Vitrectomy with or without Internal Limiting Membrane Peel for Epiretinal Membrane: A Systematic Review and Meta-Analysis
10
PubMed. Comparing outcomes of local and regional anesthesia in vitreoretinal surgery: A systematic review and network meta-analysis
11
PubMed Central. Efficacy and safety of ‘dropless vitrectomy surgery’ and comparison of outcomes to standard of care topical therapy
12
PubMed. Long-term results of macular pucker surgery
13
PubMed Central. Reading ability and retinal sensitivity after surgery for macular hole and macular pucker
14
ScienceDirect (JFO Open Ophthalmology). Where did the macular pucker go?
15
PubMed Central. The Postvitrectomy Cataract
16
PubMed. Complications of surgery for epiretinal membranes
17
PubMed Central. Outcomes after Epiretinal Membrane Surgery with or Without Internal Limiting Membrane Peeling
18
PubMed Central. Three-Dimensional Retinal Displacement before and after Macular Pucker Surgery