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Why Your Retina Specialist May Give You an Injection Before Diabetic Retinal Detachment Surgery
How the Pre-Surgery Injection Works
The injection given before vitrectomy surgery is not a treatment for the detachment on its own. It is a preparation step designed to reduce bleeding and improve surgical conditions inside the eye.
Almost all pre-surgery injections for this condition use an anti-VEGF drug. VEGF (vascular endothelial growth factor) is the protein that signals the eye to grow new abnormal blood vessels. Anti-VEGF medicines block that signal, causing the fragile new vessels to shrink. Commonly used options include bevacizumab (Avastin), aflibercept (Eylea), and ranibizumab (Lucentis). Avastin is used most often before vitrectomy for this condition, largely because it acts quickly on abnormal vasculature and is widely available.
The drug does not remove or loosen the scar tissue. What it does is starve the abnormal vessels inside the fibrous sheets on the retina, causing them to shrink over several days. When those vessels are smaller and less active, the tissue your surgeon needs to cut and peel bleeds far less during surgery. The scar tissue itself still needs to be removed surgically.
Studies looking at anti-VEGF given before vitrectomy for diabetic tractional detachment have found real, measurable benefits related to bleeding and surgical complications.
- Bleeding into the eye in the early weeks after surgery was found in roughly 12 out of 100 eyes treated with an injection, compared to roughly 31 out of 100 without one
- Accidental retinal tears during surgery occurred at similar rates, with fewer tears in the injection group
- Operating time and the need for repeat surgery were both lower in groups that received the pre-surgery injection across multiple trials
- Vision outcomes at six months showed some benefit with the injection, though researchers noted that this finding is based on lower-certainty evidence
These are group averages from clinical studies. They reflect the overall benefit of the approach, not a guarantee for any individual eye.
The injection will not reattach the retina on its own. No number of injections can release the mechanical pull of scar tissue that has already formed. The purpose is purely to prepare the surgical field. The vitrectomy is what actually repairs the detachment.
Why the Timing Between the Injection and Surgery Matters
The gap between the injection and the operation is short by design, and changing that gap carries real risk.
The anti-VEGF drug quiets the abnormal blood vessels quickly, but as those vessels shrink, the fibrous scar tissue around them can tighten. Contracting scar tissue pulls harder on the retina, which is the opposite of what the injection was meant to achieve. Evidence from published studies suggests that operating within five to six days of the injection is associated with less severe scarring and fewer surgical complications, while waiting beyond about two weeks is associated with a higher risk of traction progressing or worsening before surgery takes place.
If anything threatens to move your surgery date after you have had the injection, contact our office immediately. A delay is not automatically dangerous, but it is exactly the situation that raises the risk of scar tissue tightening before the operation. Your retina specialist may bring the surgery forward, find an earlier slot, or arrange an urgent examination to check on the traction before deciding how to proceed.
While you are waiting for surgery day, one change matters more than any other: a clear drop in your central vision, or a shadow spreading in from the side of your visual field. Either of these can signal that the traction has progressed and may affect how soon you need to operate. Call our office the same day rather than waiting for your next scheduled appointment. Catching a change early gives your surgeon the best chance to respond to it in time.
Who Is a Good Candidate for a Pre-Surgery Injection
Not every patient having vitrectomy for a diabetic tractional detachment will receive a pre-surgery injection. The decision is based on what the retina specialist sees in your specific eye.
The injection works best when the scar tissue on the retina is still full of active, blood-filled vessels. Your retina specialist can see this during examination: vessels that appear red and full rather than white and empty are likely to bleed when the surgeon cuts and peels during the operation. In those cases, shrinking the vessels first makes a meaningful difference to how the surgery goes.
If the scar tissue has already gone white and bloodless, there is very little abnormal vasculature left to shrink. In that situation, the injection offers less benefit and introduces unnecessary risk, because even a small tightening of the scar can worsen traction before surgery. Some surgeons rarely use pre-surgery injections for this reason, particularly when there is any chance the surgery date might be delayed. If your surgeon is not recommending the injection, asking why is a completely reasonable question.
A few specific circumstances may mean the injection should not be given on a particular day.
- An active infection in or around the eye
- A known allergy to the drug being used
- Active inflammation inside the eye
- A stye, red eye, or discharging eye at the time of the appointment
You should also let our team know before your injection appointment if you have had a recent stroke or heart attack, if you are pregnant or may be pregnant, or if you have had a reaction to a previous eye injection. None of these is automatically a reason to cancel, but each one changes the conversation about how to proceed safely.
What to Expect From the Injection Appointment
Most patients find the injection appointment much shorter and less uncomfortable than they expected.
Your eye is numbed with drops or gel before the injection. The area is then cleaned with an antiseptic to reduce the risk of infection. A small clip gently holds the eye open, and a very fine needle delivers the medicine through the white of the eye while you look in a specific direction. The procedure takes only a few minutes from start to finish.
Most people describe a brief sense of pressure rather than pain during the injection itself. Afterward, the eye may feel gritty or mildly irritated for a day or so, usually because of the antiseptic rather than the needle. A bright red patch on the white of the eye is common and is caused by a small surface blood vessel breaking during the procedure. It looks alarming but is harmless and fades on its own within a week or two. Small floating shapes or bubbles in the vision are also common in the first day and settle quickly.
While most post-injection symptoms are mild and expected, a small number of signs require you to contact our office the same day rather than waiting.
- Severe eye pain, or pain that gets worse after the first day instead of improving
- A sudden drop in vision, or a new curtain or shadow across your sight
- A significant increase in new floaters, or new flashing lights
- A red eye that becomes increasingly sensitive to light
- Thick discharge from the eye, or a lid that swells shut
These symptoms can be signs of infection inside the eye, known as endophthalmitis, which is rare but serious and far easier to treat when caught early. Serious infection after an eye injection is uncommon, but when it does occur, the same-day response is what makes the difference. If you cannot reach our office, go to an emergency room.
The Vitrectomy Surgery Itself
The vitrectomy is the operation that actually repairs the detachment. The injection before surgery is preparation. The surgery is the treatment.
Vitrectomy is a surgical procedure performed at an outpatient surgery center. The surgeon makes small openings in the white of the eye and uses fine instruments to remove the vitreous gel, carefully peel and cut away the scar tissue pulling on the retina, and then reposition the retina against the back of the eye. The operation may take anywhere from one to several hours depending on how complex the scar tissue is. Most patients go home the same day.
Many vitrectomies for tractional detachment are performed with local anesthesia combined with sedation. The local anesthetic numbs the eye and prevents it from moving during surgery, while the sedation keeps you relaxed and comfortable. General anesthesia, where you are fully asleep, may be used when the case is expected to be long or when lying still for an extended period would be difficult.
At the end of surgery, the surgeon often places a gas bubble inside the eye to help hold the retina against the back wall while it heals, or silicone oil when longer-term support is needed. The gas bubble slowly absorbs on its own over several weeks. Silicone oil typically requires a second, smaller procedure to remove it at a later date. Your retina specialist will tell you which option is planned for your eye and why.
Vitrectomy for diabetic tractional detachment carries the risks associated with any eye operation, plus some specific to this condition.
- Infection inside the eye
- Bleeding during or after the operation
- Accidental retinal tears or further detachment
- Raised pressure inside the eye, which can affect the optic nerve over time
- Cataract formation, a clouding of the eye's natural lens, which is common after vitrectomy and can be treated with routine cataract surgery later
The pre-surgery injection is specifically intended to reduce the risk of bleeding and accidental tears during the operation. It does not eliminate these risks, but evidence suggests it meaningfully lowers them.
Recovery After the Injection and After Surgery
The recovery from the injection is brief. The recovery from vitrectomy is longer and requires more planning.
Expect a gritty, slightly bloodshot eye for a day or two. The antiseptic is the usual cause of the stinging sensation, and the red patch on the white of the eye is a surface-level change that fades on its own. These are expected and not a reason for concern. What is not expected is pain that increases after the first day, or vision that worsens instead of staying stable. Those are the warning signs described in the section above and require a same-day call.
This recovery period is more demanding than the injection and requires advance planning. Vision is usually blurry at first, particularly if a gas bubble is present. The bubble sits in the lower part of the visual field and creates a wavering line across the sight that gradually rises as the bubble shrinks. Eye drops are typically prescribed for several weeks to prevent infection and reduce inflammation.
Head positioning is one of the most underestimated parts of recovery. Some patients are asked to remain face-down or in another specific position for hours at a time for several days or weeks. This allows the bubble to press against the correct area of the retina. Renting or borrowing a face-down support pillow or massage chair rest before surgery makes this much more manageable.
If a gas bubble was placed during surgery, air travel is not allowed until the bubble has completely absorbed. Altitude causes the bubble to expand, which can dangerously raise pressure inside the eye. The same caution applies to driving through high mountain elevations. If silicone oil was used instead of gas, this particular restriction does not apply in the same way, but an additional surgery will eventually be needed to remove the oil. Ask your retina specialist exactly which situation applies to you before making any travel plans.
Practical arrangements deserve attention before the day arrives. Arrange a driver in advance, since you will not be able to drive yourself home. Ask our team what to do about insulin or diabetes medications on the morning of surgery, as fasting is usually required. Bring a complete and current list of all medications and supplements to your pre-operative visit, including blood thinners. Decisions about continuing or pausing blood thinners before surgery are made by your surgical and medical teams together and should never be made on your own.
Risks, Trade-Offs, and Realistic Expectations for Vision
Understanding the honest picture of what this treatment can and cannot achieve helps you prepare for what comes next.
The most significant risk specific to the pre-surgery injection is that the drug can cause scar tissue to tighten as the vessels within it shrink. In some cases, this tightening can worsen the traction before surgery takes place. Published studies have reported rates of traction progressing after the injection ranging from roughly 1.5 to 18 out of every 100 eyes across larger studies. The practical protection against this risk is keeping the surgery date as close to the injection as planned and reporting any sudden drop in vision immediately.
Serious infection inside the eye, called endophthalmitis, is the most serious risk of any intravitreal injection. It is uncommon. Large studies counting infection rates across tens of thousands of injections have found it in fewer than 4 out of every 10,000 injections. When it does occur, early treatment makes a significant difference, which is why the warning signs described earlier require a same-day response rather than a wait-and-see approach.
Surgery for a diabetic tractional detachment is most often aimed at preserving the vision that remains rather than restoring what has already been lost. The outcome depends heavily on whether the macula was still attached at the time of surgery, how long it had been detached if it was not, and how much healthy retinal tissue was available going into the operation. The retina can be successfully repositioned in many cases, but how much useful sight returns afterward varies from person to person and cannot be predicted from a description of the condition alone.
Most patients going through this process are trading the prospect of slow, ongoing vision loss for the chance at stability. That is a meaningful goal, and it is the honest framing your retina specialist will offer you.
Frequently Asked Questions
Here are answers to questions our patients commonly ask after being told they need an injection before vitrectomy surgery for a diabetic tractional detachment.
No. Even if the injection causes the abnormal blood vessels to shrink significantly, the scar tissue they formed still remains attached to the retina. That tissue can only be removed by a surgeon cutting it away from inside the eye during vitrectomy. The injection makes surgery safer and more manageable, but it does not treat the mechanical pull that is lifting the retina off the wall of the eye.
This decision is made by your retina specialist together with the doctor who prescribed your blood thinner, and it is never a choice to make on your own. Stopping a blood thinner can carry risks that outweigh the extra bleeding concern during eye surgery, and many surgeons proceed without stopping these medications. Bring a complete list of all your medications, including over-the-counter supplements, to your pre-operative appointment so the team can advise you specifically.
Contact our office the same day, without waiting for your scheduled appointment. A noticeable drop in central vision or a new shadow spreading across your sight can mean the traction has progressed, which may change how quickly your surgeon needs to operate. This is exactly the kind of change the short gap between injection and surgery is designed to prevent, and acting on it promptly gives you the best possible outcome.
The choice between available anti-VEGF medicines before vitrectomy is largely practical. Avastin is commonly used because it acts quickly on abnormal vessels and is widely accessible, though it is used off-label for this specific purpose. Eylea and Lucentis are formulated specifically for use inside the eye and carry FDA-approved uses for diabetic retinopathy. Before vitrectomy surgery, your retina specialist selects the option that best fits your situation, the planned surgical timing, and practical availability. The goal is the same regardless of which drug is chosen.
Many patients do, but for a different reason than the pre-surgery injection. After vitrectomy, ongoing anti-VEGF injections may be used to treat active diabetic disease in the retina, such as swelling in the macula or new vessel growth. Laser treatment may also be part of the long-term plan. Your retina specialist will review your imaging at each follow-up visit and adjust the treatment schedule based on what your eye shows over time, particularly during the first year after surgery.
It can. Diabetic eyes can continue to develop new scar tissue and new abnormal vessels even after a vitrectomy, and a further operation is sometimes needed. Bleeding can also recur inside the eye. This is one reason follow-up visits after surgery are closely scheduled rather than spaced out. Keeping those appointments, along with maintaining good control of blood sugar and blood pressure, is the most effective way to protect the results of the surgery over time.
Visit Atlantic Retina Center for Expert Retinal Care
Our team at Atlantic Retina Center specializes exclusively in the retina, vitreous, and macula, bringing focused vitreoretinal expertise to every patient we see across the Eastern Shore of Maryland and central and southern Delaware. If you have been diagnosed with a diabetic tractional retinal detachment, or if your general eye doctor has referred you for an opinion, we are here to guide you through every step with clarity and care. We welcome you to schedule a consultation and experience the difference that single-specialty retinal care provides.