Retina & Vitreous
Macular pucker: when a fine membrane draws the centre of the retina into folds
A macular pucker is not wear and tear of the retina but a wafer-thin membrane that grows on it and contracts it. The picture does not become darker as a result, it becomes skewed: window frames ripple, letters jump, a veil lies over the middle. Much of this is good news — very many findings stay stable over years and are only monitored. What matters is that someone looks to see which finding it actually is.
What a macular pucker is — and why it has three names
The macula is the centre of the retina, a few millimetres across. With it you read, and recognise faces and road signs — everything you look at directly. A Macular pucker is a wafer-thin, essentially transparent layer of cells that grows on the surface of this centre of the retina. It is not part of the retina, it lies on it, like a film stretched over it.
Such fine membranes do not stay smooth. They contract over time, and because they are attached to the retina they take it with them: the centre of the retina settles into fine folds. That is exactly what sits in the English word 'pucker', the puckering — and it is exactly what explains the symptoms. Nothing in the retina is destroyed to begin with; it is warped. That is why the picture does not become darker either, but skewed.
In doctors' reports and on OCT findings you will meet two further names for the same finding: epiretinal gliosis and epiretinal membrane. Both say literally the same thing — a layer of cells or connective tissue on ('epi') the retina ('retinal'). If the membrane is still so delicate that it barely warps the retina, you sometimes also read cellophane maculopathy. Three names, one finding; which of them appears on your report says nothing about how severe it is.
How the retina connects with the vitreous in front of it, and what other findings arise at that interface, is set out in the overview of the retina and the vitreous.
Distorted vision has several causes — this is how we tell them apart
'Straight lines are crooked' is a very precise symptom for the centre of the retina — and a very unspecific one for the cause. Several findings produce this picture, and they are treated in completely different ways. Telling them apart is the real reason for the examination; it cannot be done at the kitchen table, nor from visual acuity, but from the cross-sectional image of the retina.
A membrane on the retina — or damage in the retina
With a macular pucker the problem lies on the retina: something pulls from outside on intact tissue. In the commonest mix-up it lies in the retina — with deposits, atrophy or leaking vessels beneath the centre of the retina. Both can make lines ripple, but only the second is a disease of the tissue itself, with its own dynamic over time and its own treatment. What happens there, what those affected should watch for and how it is treated, we describe where it belongs: what happens in the eye with age-related macular degeneration. For you that means one thing above all: a finding with the word 'macula' in it is not yet a diagnosis.
A fold — or a hole
The same traction that draws the centre of the retina into folds can also tear it elsewhere. Then a piece is missing at the centre, and people describe not merely a warped middle to the picture but a missing one — a grey or black patch exactly where they are looking. That is a hole in the centre of the retina (macular foramen) and it is judged differently: there the question of surgery comes up considerably earlier than with a macular pucker. The two can occur side by side; separating them visibly on OCT takes seconds.
And if it comes on suddenly
A macular pucker develops over months to years. If the distortion comes on suddenly, if it comes with flashes of light, with a swarm of new black dots or with a shadow from the edge, then that does not fit this finding but something happening at the periphery of the retina — up to and including a retinal detachment and its four warning signs. That situation does not wait for the next check-up appointment.
Symptoms: how you notice a macular pucker
The symptoms all arise from the same mechanics — a warped centre of the retina reports the picture back warped:
- Distorted vision (metamorphopsia). Straight lines look wavy or kinked: window frames, tile joints, lines of text, the edge of a door panel.
- A grey veil over the middle of the picture. Not dark but milky — as though a breath of fog lay exactly where you are looking.
- Letters with double contours. Reading is tiring, lines jump, single words look squashed together.
- A difference in size between the two eyes. The same object looks smaller or larger with one eye than with the other (micropsia, macropsia) — a very typical sign, and one that is noticed almost only when you cover an eye.
- Usually one eye, usually slowly. The symptoms increase over months, often so gradually that they are dismissed as 'getting older'.
What is not part of it: pain, a red eye, a loss at the outer edge of the field of vision. A macular pucker does not hurt, and it does not take your visual field either — it takes the precision at the centre.
You can test this yourself, and more reliably than any sight test on the wall: cover one eye and then the other and look at a regular pattern — a window grille, a tile joint, a sheet of squared paper. If the lines ripple with one eye only, or a piece is missing in the middle, note it down and have it looked at. The same test sits, together with a few others, in our free online check for eyes and eyelids. It does not make a diagnosis and does not replace an examination — it makes visible what you would otherwise not notice.
When you should not wait for an appointment
A macular pucker is not an emergency — that needs saying plainly, so that nobody with a slowly grown finding panics unnecessarily. There are, however, situations in which the distortion has a different sign to it and waiting does harm:
- New flashes of light, a sudden swarm of black dots or a shadow moving in from the edge into the field of vision — have it assessed the same day.
- A deterioration within days rather than over months. That does not fit a membrane, but rather a swelling, a bleed or newly formed vessels.
- A new, dark patch exactly at the centre, one that does not blink away — have it examined within a few days, not at the next routine appointment.
- The same signs after eye surgery or an injury, even weeks later.
And outside this list the calm route still applies: describe to us on the phone what you are seeing and since when, and we will tell you whether it is a regular appointment or not. If it is a regular appointment, you can book it online for a macular check-up.
How a macular pucker develops
In most cases no underlying disease is found — the finding arises from an entirely normal ageing process in the eye. That is called idiopathic, which simply means: with no recognisable outside cause. Alongside these there are the secondary forms, in which something has gone before. The distinction is not academic: with a secondary form the underlying disease belongs in the treatment too, otherwise you treat the consequence and let the cause run on.
Idiopathic — after the vitreous separates
The vitreous, the gel-like interior of the eye, liquefies over the years and separates from the retina. That process is normal and usually without consequence; it is at the same time the commonest trigger of a macular pucker. Microscopic remnants and tiny defects are left behind on the surface of the retina, and through these cells can migrate onto the retina and form a membrane there. How this posterior vitreous detachment makes itself felt in the eye, we describe on a page of its own — it is the reason why macular puckers occur predominantly after the age of 60.
Secondary — after an event in the eye
The second group arises as a reaction to something that has irritated or injured the retina. This includes:
- a retinal tear or a retinal detachment and its treatment with laser, cold or surgery
- Inflammation inside the eye, such as an inflammation of the middle layer of the eye (uveitis)
- Vascular occlusions of the retina as well as retinal changes in diabetes mellitus
- Eye operations — above all when the course was complicated
- Injuries and contusions to the eye, sometimes months earlier
What is deliberately absent from this list: everything one might have done differently. Screen work, reading in poor light, phone use or the wrong glasses do not cause a macular pucker. Anyone wondering what they could have prevented can, as a rule, set that question aside.
Many macular puckers stay stable — watching is a real option
This is the message that should stand at the start of this section, because it is the one most often lost in the consultation: a large proportion of these membranes change hardly at all over years. They are there, they are clearly visible on the cross-sectional image, and they do little in everyday life. For these courses the right treatment is no treatment, but a check-up at agreed intervals. Watching here is not putting you off, it is the treatment with the best ratio of benefit to risk.
What we do at those appointments is simply described and hard to replace. We examine the retina with the pupil dilated and take an OCT cross-sectional image of the macula — a contact-free image at microscopic resolution that makes the membrane, the folding, the thickness of the centre of the retina and any swelling visible. The value of this image lies less in the single picture than in the comparison: only two images months apart tell you whether a finding is holding steady or moving. What else belongs to a complete examination you can read under what is done at an ophthalmic examination.
These check-ups we take on close to where you live, in Zurich, Wetzikon and Meilen, and each time we examine the second eye as well. Please bring someone with you to the appointment, or plan the way back without a car: the drops that dilate the pupil go on working for several hours.
Between two appointments you are yourself the best measuring point. Check each eye separately against a grid pattern once a week and get in touch if the distortion increases noticeably — then we bring the check-up forward instead of waiting for the calendar.
Vitrectomy with membrane peeling: what the procedure can do and what it cannot
There are no eye drops, no injection and no laser treatment that dissolve an epiretinal membrane. If a macular pucker is treated, it is treated mechanically: the membrane is peeled off the retina. That happens as part of a Vitrectomy — through fine ports the vitreous is first removed, and the membrane is then lifted off the centre of the retina with micro-forceps ('membrane peeling'). The procedure can be planned and is usually done under local anaesthetic; how long it takes, and whether it is done as an outpatient or an inpatient, is for the centre that carries it out to tell you.
We do not carry out operations inside the eye ourselves. If your finding calls for one, we tell you in the same conversation and arrange the referral to a retinal surgery centre, so that you do not have to see to it yourself. The assessment beforehand and the check-ups afterwards we take on close to where you live, at our three locations — so you keep the person you deal with, even when the procedure takes place elsewhere.
When the procedure is worth it — and when it is not
What is operated on is not the finding but the impairment. In favour: distorted vision that really does get in your way when reading, at a screen, driving or recognising faces; visual acuity that gives way across the check-ups; a finding that is demonstrably progressing on OCT. Against: a stable course, few symptoms — and a second eye that catches everything in daily life. Where the centre of the retina has been affected for a very long time and is severely thinned, the gain to be expected is small as well; that too belongs in the conversation before anyone is given a date in the operating theatre.
What the procedure honestly achieves
What improves most reliably is the distorted vision; and for most people that is also what bothers them most. Your visual acuity often recovers partly, rarely completely, and it does so slowly: the recovery stretches over many months in which at times little seems to happen. Some residual distortion or blur can remain. The shorter the time the membrane has been pulling, and the more orderly the structure of the centre of the retina still is on OCT, the more comes back — that is the most honest measure there is beforehand. Numbers that promise a result do not exist here.
What has to be weighed up
Every procedure inside the eye carries risks, and they do not get smaller by being discussed only afterwards. After a vitrectomy, an eye that still has its own lens often develops, within the following months to years, a clouding of the lens of the eye (cataract), which can then be treated in its turn. A retinal tear or a retinal detachment after the procedure, an infection inside the eye, or renewed growth of the membrane are rare. Often the innermost limiting layer of the retina is peeled off as well during the operation, to make a recurrence less likely. Which of these points has to be discussed in your case is settled by the pre-operative discussion at the centre performing the surgery — prepared with the findings we take.
Costs & health insurance
What does the insurer pay for — and what not?
A macular pucker is a medical finding, not an aesthetic wish — even when the procedure can be planned. 'Elective' means you can choose when, not that you pay for it yourself. Assessment, follow-up checks and an indicated operation therefore run through basic health insurance (OKP); what remains for you is the deductible and co-payment, as at any doctor's appointment.
| Service | Coverage | What this means for you |
|---|---|---|
Assessment for distorted vision (examination, OCT of the macula) | Basic insurance (OKP) | Examination with the pupil dilated and a cross-sectional OCT image are mandatory benefits where there are symptoms or a conspicuous finding. The deductible and co-payment apply as at any doctor's appointment. |
OCT follow-up checks with a known macular pucker | Basic insurance (OKP) | The check-ups are the core of the treatment for as long as the finding is being watched. The interval follows the finding and its course, not a fixed schedule. |
Vitrectomy with membrane peeling | Basic insurance (OKP) | Covered where the indication is established; the procedure is billed by the centre performing it. If it is done as an inpatient, your room and choice of doctor follow your insurance model, and the statutory hospital contribution of CHF 15 per day is added as well (adults). |
Follow-up appointments and checking the second eye | Basic insurance (OKP) | Follow-up checks after the procedure are medically indicated, as is examination of the fellow eye. We take on both close to where you live, in Zurich, Wetzikon or Meilen. |
New spectacle lenses after the operation | Usually not | Spectacle lenses are as a rule not a service of basic health insurance for adults. For individual medical indications the MiGeL provides for contributions; whether your situation is one of them is for you to clarify with your insurer — we put together the details needed. |
If you would like to know before the appointment what to expect, ask us: +41 44 500 69 00 or through the contact form. With a planned operation you receive the cost breakdown from the centre performing it before you decide.
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Medically reviewed by PD Dr. med. Andrea von Rückmann · Last reviewed
Frequently asked questions
- Yes. Both times what is meant is the same wafer-thin membrane on the centre of the retina. 'Macular pucker' describes what is seen — the puckering of the macula. 'Epiretinal gliosis' and 'epiretinal membrane' describe what lies there: a layer of cells on ('epi') the retina ('retinal'). On doctors' reports and OCT findings you will mostly find the second wording, and in conversation the first. At a very early stage, when the membrane barely warps the retina yet, you sometimes also read 'cellophane maculopathy' — the same process, only earlier.
- No, and that is more the rule than the exception. Very many membranes change hardly at all over years and disturb everyday life little; the right treatment is then a follow-up check with OCT and nothing else. What is operated on is not a picture but an impairment: when the distorted vision really does get in your way when reading, at a screen, driving or recognising faces, or when the check-ups show that the finding is progressing. An OCT image on its own is not an indication for surgery.
- It happens, but it is rare: occasionally a membrane detaches spontaneously from the retina and the distorted vision improves. Waiting for that is still not a strategy, because there is no telling in advance whom it happens to. The sensible position is the middle one: do not operate hastily, but do not spend years watching without check-ups either. The course decides, and the OCT is what makes it visible.
- Usually very slowly — over months to years, and in some of those affected not at all. That is exactly why it is often picked up by chance, for instance when one eye is covered at an eye test and the difference stands out. A rapid deterioration within days does not fit this finding and points to something else: to a swelling at the centre of the retina, to a bleed or to something happening at the edge of the retina. Then the eye does not belong in the next follow-up check but needs examining promptly.
- Honestly: usually not completely. What improves most reliably is the distorted vision; visual acuity often recovers partly, and some residual distortion or blur can remain. The recovery stretches over months, not over weeks. As a rule of thumb: the shorter the time the membrane has been pulling, and the better the structure of the centre of the retina still is on OCT, the more comes back. Nobody can responsibly quote you percentages beforehand — the factors that speak for or against it in your case, they can.
- Yes, that is not unusual, because the triggers — the age-related separation of the vitreous from the retina above all — affect both eyes. The two eyes are often at different stages. That is why, with a macular pucker, we examine the fellow eye as a matter of course, even when it is free of symptoms, and include it in the check-ups. You would otherwise hardly notice a beginning finding in the second eye, because the better eye compensates for the distortion when both eyes are open.
- Assessment, OCT, follow-up checks and — where it is indicated — the operation are medically indicated with this diagnosis; the cost is covered by basic health insurance. What remains for you is the deductible and co-payment, as at any doctor's appointment. Nothing here is a self-pay service, even though the procedure can be planned: elective means 'you can choose when', not 'cosmetic'. If the operation is done as an inpatient, your room and choice of doctor follow your insurance model; the procedure itself is not affected by that. We are glad to settle questions about billing beforehand on the phone.
Wavy lines should be looked at, not blinked away.
A macular check-up with OCT gives you clarity in a single appointment: whether it is a macular pucker, whether it is affecting you at all and whether watching is enough. If watching is the right answer, we tell you so just as plainly as we would tell you that a procedure is due.
Or call us: +41 44 500 69 00 — Mon–Fri 08:00–12:00 / 13:00–17:30. Appointments in Zurich, Wetzikon and Meilen. You can also book an appointment online.