Vitrectomy for floaters: how and why do surgeons' approaches differ?Floater surgery: how surgeons differ
Vitrectomy for floaters varies more between surgeons than many people expect. Surgeons differ on whether floaters should be operated on at all, and on many decisions during the operation: instrument size, whether to separate the gel from the retina, how much gel to remove, how the edge of the retina is checked and treated, what is left in the eye at the end, whether to combine cataract surgery, and the anaesthetic. Several of these choices change the chance of a retinal tear or detachment, a cataract, or floaters coming back. Few have been settled by randomised trials, so they depend on each surgeon's training, experience and judgement. That is why it is worth choosing your surgeon carefully and asking how they would approach your own eye.
Why do some surgeons not operate on floaters at all?
The first difference is philosophical. Most floaters are harmless: they are caused by normal ageing changes in the vitreous gel, they do not damage the retina or the optic nerve, and many people stop noticing them over months as the floaters settle and the brain adapts. For that reason, some retinal surgeons believe that surgery, with its small but real risks, is hard to justify for a problem that does not threaten sight, and they rarely or never offer it.
Other surgeons see persistent floaters as a real disability for a minority of people. Floaters can reduce contrast, make reading and screen work tiring, and cause considerable distress. In a Singapore study of 266 people attending a clinic with floaters, participants said they would trade on average about one year in every ten of their remaining life to be rid of them. Surgeons in this camp argue that the profession has too often dismissed these patients, and that careful surgery with modern small instruments can help the ones who are most affected.
The divide is visible in surveys. In a 2015 United States survey of retinal surgeons, 25% of the 159 who replied said they were likely to operate on floaters, although 69% had done so at some time. Surgeons who had operated on floaters before, and those who did many vitrectomies each year, were more likely to offer it again. The authors concluded that the main barriers were the ordinary risks of vitrectomy, concern that patients' expectations would be unrealistic, and fear of criticism from other retinal surgeons. Only about 6% of the surgeons invited replied, so the true proportions are uncertain. A review by Australian authors took a middle position: many people's floaters do not remain troublesome, selecting who will benefit is often difficult because there is no widely used objective test of floater severity, and the risks of surgery need to be weighed carefully.
Many retinal surgeons feel that floater surgery has become more accepted as instruments have become smaller and studies have measured the burden of floaters. The one country with published national figures does not show it becoming routine: in Denmark, where every operation is recorded, floater surgery was uncommon between 2010 and 2023, fell among women and was stable among men, and the authors noted that there are no standard guidelines on who should have it. For you, the practical point is that a surgeon who advises against surgery is not necessarily dismissing your symptoms, and a surgeon who offers it is not necessarily being casual about risk. Their thresholds differ. The alternatives to surgery, including laser, are covered in YAG laser or vitrectomy for floaters and treating floaters without surgery.
What does every floater operation involve?
Floater surgery is a pars plana vitrectomy, the operation described on the vitrectomy page. Three small ports are placed in the white of the eye a few millimetres behind the coloured iris. One carries an infusion line that keeps the eye inflated with fluid, one a light pipe, and one the vitrectomy probe, which cuts the gel into tiny pieces and draws it out together with the floaters. At the end the ports are removed. It is usually a day procedure, and most people go home the same day.
Vitrectomy for floaters
Dr Chen removing the vitreous gel and its floaters during vitrectomy. It shows real eye surgery.
Watch on YouTube →Whatever the technique, the main serious risks are a retinal detachment, which followed roughly 1.5 to 2.5 in every 100 floater operations in published series and needs further surgery, and infection inside the eye. Rarely, these complications cause permanent loss of vision. Cataract is the most common consequence in people who still have their own lens.
The approaches described below vary the steps of this sequence, and those variations are where surgeons' results and risks can differ. The aim is always to clear the floaters from the line of sight as safely as possible.
Does the size of the instruments differ?
Yes. Instrument size is measured in gauge, and a higher number means a thinner instrument. The larger 20-gauge system, which needed stitches, has largely been replaced by 23-, 25- and 27-gauge instruments that usually seal without stitches. In the largest recent floater series, 25-gauge instruments were used in 98.9% of operations.
No study has compared 25-gauge with 27-gauge surgery in people with floaters. In other operations, 27-gauge surgery took about 4 minutes longer on average in a pooled analysis, although one large randomised trial found no significant difference in total time. In that trial the ports sealed without a stitch slightly more often with 27-gauge (97% compared with 91%), and final vision was similar or very slightly better. A 27-gauge probe is more flexible, needing roughly 40% to 50% less force to bend in one laboratory study, which matters more in delicate membrane surgery than in clearing floaters. For most people with floaters, gauge is one of the smaller choices, and 25-gauge vs 27-gauge vitrectomy for floaters compares the two in detail. Dr Chen uses both 25-gauge and 27-gauge, depending on the individual patient's clinical situation.
Should the surgeon separate the gel from the retina?
This is one of the most important differences between surgeons. Many people with floaters already have a posterior vitreous detachment (PVD), in which the back surface of the gel has separated from the retina, and then there is nothing to separate. When the gel is still attached, usually in younger and short-sighted eyes, the surgeon can either induce a PVD, lifting the gel off the retina with suction on the probe, or leave the attached gel in place and remove only the central gel.
Inducing a PVD aims to remove the gel that could separate later and produce new floaters. Leaving the gel attached avoids pulling on the retina during surgery. The evidence points both ways, and no randomised trial has compared the two. In one floater series, surgery that did not induce a PVD was followed by new floaters in 14 of 99 eyes (14%) that had no complete PVD beforehand, most of whom chose a second operation, and in none of 179 eyes that already had one. The recurrences were mostly in young, short-sighted men with their own lens, and the authors now suggest considering inducing a PVD in such eyes. On the other side, one floater series found more retinal breaks during surgery when a PVD was induced, while another did not. Should the surgeon induce a posterior vitreous detachment? covers this choice in detail.
How much of the gel is removed?
Surgeons also differ in how far towards the edge of the eye they go. Some remove the central gel that carries the floaters and deliberately leave a rim of gel at the periphery and a cushion of 3 to 4 mm of gel behind the lens. Others remove the gel much closer to its firm attachment at the edge of the retina, the vitreous base, often pressing on the outside of the eye to bring the periphery into view and sometimes using an additional light fixed in the eye wall so both hands are free. This is sometimes called shaving the vitreous base.
The case for a limited operation is safety. The gel is most firmly attached to the retina at the periphery, and working there may increase the chance of a retinal break. In an international survey of 581 floater operations reported by their surgeons, retinal breaks were found during surgery in about 15% of eyes when surgeons described the vitrectomy as complete, compared with about 1% when it was less extensive. Retinal detachment afterwards was not significantly different between the groups, and the study was not randomised, so other differences between the operations may explain part of this.
The case for a more complete operation is that remaining gel can later produce floaters of its own. That reasoning is widely held but has not been measured directly: no floater study has compared recurrence after limited and extensive surgery. In one series of 142 eyes, about 7 in 10 of which were surveyed four to seven years after small-gauge surgery, about 3 in 10 had noticed some floaters again, but only 2% described them as significant.
Leaving gel behind the lens may also slow cataract formation, which is discussed below. In one small comparison of eyes with their own lens followed for at least two years, 35% needed cataract surgery after limited surgery, compared with 87% after more extensive surgery. The groups were not randomised and differed in size and age.
How do surgeons check the edge of the retina?
Before finishing, surgeons examine the edge of the retina for any break caused during surgery, because an untreated break can lead to a retinal detachment. In an older series of 645 vitrectomies for other conditions, using larger 20-gauge instruments, about 1.7% of eyes developed a retinal detachment from breaks that had been missed or formed later.
Surgeons differ in how they look. Many use scleral indentation: with a small blunt instrument, the surgeon or an assistant presses gently on the outside of the eye, pushing the eye wall inward so that the far edge of the retina, normally hidden behind the iris and lens, comes into view and can be inspected all the way round. Others rely mainly on modern wide-angle viewing systems, which show much of the periphery without pressure, and indent only where they need to.
Indentation is the traditional method and many surgeons regard it as the most thorough, but no study has compared the two approaches at the end of floater surgery, so how many small breaks wide-angle viewing alone might miss is not known.
Is laser used on the retina as a precaution?
When a retinal break is found, it is sealed with laser or a freezing treatment in every approach. Surgeons differ on whether to treat a healthy retina as a precaution. Some apply a ring of laser spots around the whole periphery (360-degree laser) in selected eyes, most often short-sighted ones, with the aim of reducing the chance of a later detachment. Others treat only breaks and weak areas they can see. In the largest recent floater series, laser of any kind was applied during surgery in about 9% of eyes.
There is no floater-specific evidence on routine 360-degree laser. The studies come from other operations and disagree. In surgery for retinal detachment, a 2026 pooled analysis of 13 studies found that 360-degree laser was associated with a higher chance of the retina staying attached after one operation, but a large series of detachments in eyes with a lens implant found no benefit, and a study of macular surgery found that precautionary laser applied beforehand did not reduce later tears or detachments, although events were too few to rule out a small effect. Laser also has potential downsides: after detachment surgery, more extensive laser treatment has been associated with scar tissue forming on the macula (an epiretinal membrane) in one study, although the 2026 pooled analysis found no clear increase with 360-degree laser, and a precautionary ring treats retina that may never have caused trouble. The decision is therefore a matter of judgement, usually based on how short-sighted the eye is and what the surgeon sees in the periphery.
Why do some surgeons stain the gel?
The vitreous gel is clear, which makes it hard to see what has been removed and whether the gel has separated from the retina. Some surgeons inject a small amount of triamcinolone, a steroid suspension whose white particles stick to the gel and make it visible. Others do not use it for routine floater surgery. In a large controlled trial in vitrectomy for other conditions (774 eyes), staining was associated with fewer retinal breaks during surgery (8.7% compared with 14.1%), while more people needed pressure-lowering drops afterwards, although eye pressure was generally well controlled. Surgeons aim to remove the steroid particles before the end of the operation. Whether routine staining improves floater surgery has not been studied.
How do surgeons try to protect the natural lens?
Cataract is the most common consequence of floater surgery in people who still have their own lens. In a pooled analysis of floater studies, cataract developed in about a third of eyes, and in individual series of eyes with their own lens the proportion developing a cataract or needing cataract surgery ranged from under 10% in people under 50 to about half or more in older groups. Age is the strongest factor. If you have already had cataract surgery, this question does not apply.
The leading explanation is oxygen. The vitreous gel normally keeps oxygen levels low next to the lens. During vitrectomy, oxygen measured beside the lens rose from about 9 to about 70 mmHg once the gel was removed, and eyes that have had a vitrectomy continue to have more oxygen in front of the lens. Oxygen is thought to damage the proteins in the centre of the lens, causing a nuclear cataract. Why vitrectomy causes cataracts explains this in more detail.
For this reason some surgeons deliberately leave a cushion of gel behind the lens and avoid touching the lens with instruments; others remove more gel, accepting that a cataract is likely in older eyes. The floater data on gel-sparing come mainly from the group that developed limited vitrectomy and are not randomised: even with gel left behind the lens, 36% of eyes in their largest series had cataract surgery, on average about two years after the floater operation. Leaving gel may delay a cataract, but it does not reliably prevent it. Floater surgery and cataract covers the numbers.
Should cataract surgery be combined with floater surgery?
If a cataract is already starting, or is very likely to follow, some surgeons offer cataract surgery and vitrectomy in the same operation, called combined surgery or phacovitrectomy. Others prefer to operate on floaters alone and leave cataract surgery until it is needed, or do the two operations separately.
The arguments for combining are one operation and one recovery, avoiding cataract surgery later in an eye without its gel, and removing a cataract before it develops. The arguments against are that replacing a clear lens removes whatever near focusing a person still has, which matters more at younger ages; that it adds the risks of cataract surgery to a floater operation; and that some floater patients never need cataract surgery. There are almost no floater-specific data. In the international survey of floater operations, retinal breaks were more common when cataract surgery was combined (16.5% compared with 2.9%), although most of those combined operations also involved complete removal of the gel. In macular hole and epiretinal membrane surgery, pooled studies found similar vision and complication rates whether the operations were combined or done separately. A small series of five people who had combined surgery with a multifocal lens implant for floaters reported a high rate of retinal tears, and its authors advised caution. Your age, how much your lens has already changed, your glasses prescription and your preferences for lens implants all shape this choice.
Combined cataract and retinal surgery: time-lapse
A time-lapse of combined cataract surgery and vitrectomy, filmed from the surgeon's side. It shows real eye surgery.
Watch on YouTube →Is the eye left filled with fluid, air or gas?
At the end of floater surgery most surgeons leave the eye filled with clear fluid, which the eye replaces with its own fluid within days. In the largest recent floater series, 83% of eyes finished with fluid only. Vision is often blurry for the first few days while the eye settles, but there is no bubble to wait for. Recovery after vitrectomy for floaters describes what to expect.
Some surgeons prefer to leave a partial air or gas bubble, either routinely or when a retinal break has been treated or a port does not seal well. A bubble supports the ports and treated areas from inside, and in a large study of mixed vitrectomy operations it was associated with less low eye pressure on the first day. In a pooled analysis of all vitrectomy, eyes left with air, gas or oil also had lower rates of infection than eyes left with fluid; that finding comes from observational studies and may reflect other differences between the operations. The trade-offs are that vision is poor until the bubble has gone and that you must not fly or travel to altitude while it is present, because the gas expands. In one study, an air bubble lasted about 11 days on average. A 20% SF6 gas bubble, a common short-acting gas, lasted about 17 to 18 days in a small randomised study. Gas has also been associated with faster cataract formation.
Are stitches used to close the ports?
Modern small-gauge ports are angled so that they usually seal on their own. In the largest recent floater series, 93% of operations were completed without stitches.
Some surgeons place a fine dissolving stitch whenever a port leaks at the end of surgery, and some prefer to stitch more readily. Low pressure on the first day is common when the eye is left filled with fluid, especially in long, short-sighted eyes: it occurred in 33% of such eyes in one study of mixed operations, and in about 60% of eyes in a series of 27-gauge floater surgery, where it settled within a week in every case. The authors of the first study suggested considering a stitch in these eyes.
Infection inside the eye (endophthalmitis) is uncommon but serious. Across all vitrectomy it occurs after about 1 in 700 operations. In a pooled analysis of floater surgery it was about 1 in 550, although the largest recent floater series reported 5 cases in 413 eyes (about 1 in 80). No study has shown that routine stitches reduce it in floater surgery.
What kind of anaesthetic is used?
Most floater surgery is done under local anaesthetic, with sedation through a drip to help you relax. In the largest recent floater series, 91% of operations used a sub-Tenon's block, in which anaesthetic is placed around the eye through a small opening in its outer layers with a blunt cannula. Other surgeons prefer a peribulbar block, an injection beside the eye, and some have reported operating with anaesthetic drops alone. In pooled studies of retinal surgery, sub-Tenon's anaesthesia gave the least pain, drops alone gave more pain, and peribulbar blocks had the fewest side effects.
General anaesthesia is used less often, for example for people who cannot lie still or who are very anxious, or by surgeons who prefer it. A Cochrane review (searched to 2016) found no randomised trials comparing local and general anaesthesia for vitrectomy, so the choice rests on preference, health and practicalities rather than evidence that one is safer.
How do the main choices compare?
The table summarises where surgeons differ, what each approach aims to achieve and how strong the evidence is.
| Choice | One approach | Another approach | What the evidence shows |
|---|---|---|---|
| Whether to operate | Offer surgery for persistent, troublesome floaters | Rarely or never operate, because floaters do not threaten sight | Surveys show a real divide; no guideline settles it |
| Instrument size | 25-gauge | 27-gauge | Similar results in other operations; no floater comparison |
| Separating the gel | Induce a PVD if the gel is attached | Leave attached gel and remove the central gel only | No trial; each has trade-offs for retinal breaks and later floaters |
| How much gel | Limited, leaving gel at the periphery and behind the lens | More complete, close to the vitreous base | Fewer breaks with limited surgery in one survey; later floaters not compared |
| Checking the periphery | Scleral indentation all the way round | Wide-angle viewing, indenting where needed | Not compared in floater surgery |
| Precautionary laser | 360-degree laser in selected eyes | Treat only breaks and weak areas that are seen | No floater data; conflicting results in other operations |
| Staining the gel | Triamcinolone | No stain | Fewer breaks in one large trial in other operations |
| Protecting the lens | Leave gel behind the lens | Remove more gel | Uncontrolled data; may delay but not prevent cataract |
| Cataract surgery | Combine with floater surgery | Floater surgery alone, cataract surgery later if needed | Almost no floater data; similar results in macular surgery |
| End of surgery | Fluid only | Air or gas bubble | Fluid is usual; a bubble delays vision and prevents flying, but was linked to fewer infections in observational data |
| Ports | Self-sealing | Stitch if leaking or routinely | Most operations need no stitch; effect on infection unproven |
| Anaesthetic | Local block with sedation | General anaesthetic | Local is usual; no trial comparing them |
What should I ask my surgeon?
Because many of these differences are matters of judgement, it helps to understand your surgeon's reasoning for your own eye. Useful questions include:
- Do I already have a posterior vitreous detachment, and if not, will you induce one?
- How much of the gel do you plan to remove?
- How likely am I to need cataract surgery afterwards, and would you consider combining it?
- Will I have air or gas in my eye, and when will I be able to fly?
- How will you check the edge of my retina, and would you use laser as a precaution?
- What anaesthetic do you use, and will I be awake?
- What results and complications do you see with this approach?
Other questions about differences between surgeons
Is there one best way to do floater surgery?
No approach has been shown in randomised trials to be best for everyone. Each choice trades one risk against another, and the right balance depends on your age, whether you still have your own lens, how short-sighted you are, whether the gel has already separated and what matters most to you.
Does it matter if two surgeons tell me different things?
Not necessarily. Two careful surgeons can reach different recommendations because the evidence leaves room for judgement. It is reasonable to ask each of them to explain their reasoning, including why they would or would not operate.
Can the plan change during the operation?
Yes. Some decisions are made during surgery, for example whether the gel has already separated from the retina, whether a break needs laser or whether a port needs a stitch or a bubble. Your surgeon may explain beforehand which steps depend on what is found.
Will I be awake during floater surgery?
Usually yes, but relaxed. Most floater surgery is done under local anaesthetic with sedation, so you should not feel pain and you will not see the operation in detail, although you may notice light and movement.
Where can I read more?
When are new floaters urgent?
Before any decision about surgery, new floaters need a dilated examination to exclude a retinal tear. Contact your ophthalmologist urgently, or attend an emergency department, if you notice a sudden shower of new floaters, new flashing lights, a shadow or curtain across part of your vision, or a sudden drop in vision. The same applies after floater surgery, together with increasing pain or redness. Flashes, floaters and a curtain explains why these symptoms matter.
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