Yes, diabetes can cause retinal detachment, and it’s one of the most serious complications of the disease. It happens through a specific chain of events: prolonged high blood sugar damages the tiny blood vessels in the retina, triggering abnormal new vessel growth and scar tissue that can physically pull the retina away from the back of the eye. Among people with diabetic retinopathy, roughly 2 to 4 percent develop this type of detachment, though rates climb much higher in advanced stages of the disease.
How Diabetes Leads to Retinal Detachment
The path from diabetes to retinal detachment isn’t immediate. It unfolds over years and passes through a condition called diabetic retinopathy, which has two broad phases. In the earlier phase (nonproliferative retinopathy), high blood sugar weakens and damages the small blood vessels in the retina, causing them to leak fluid or close off entirely. This starves patches of retinal tissue of oxygen.
When enough of the retina becomes oxygen-deprived, the eye responds by growing new blood vessels to compensate. This is the more dangerous phase, called proliferative diabetic retinopathy. The problem is that these new vessels are fragile and structurally abnormal. They tend to sprout from larger retinal blood vessels and grow into the gel-like vitreous that fills the center of the eye. As they grow, they use the thin membrane between the retina and the vitreous as a scaffold, creating firm adhesions between the two structures. Fibrous scar tissue develops alongside these vessels, and as that scar tissue contracts, it pulls on the retina from multiple directions.
That pulling force is what eventually detaches the retina. The scar tissue tugs the thinned, weakened retina forward and sideways, peeling it away from the tissue beneath it. This is called a tractional retinal detachment, and it’s the type most closely linked to diabetes.
Types of Detachment in Diabetic Eyes
Tractional detachment is the most common form caused by diabetes, but it’s not the only one. In some cases, the pulling force from scar tissue tears an actual hole or break in the retina. When that happens, fluid seeps through the break and separates the retina from behind, creating what’s known as a combined tractional and rhegmatogenous detachment. This combined form is less common but tends to be more severe because two separate forces are working to pull and push the retina out of place.
The distinction matters because the combined type often progresses faster and can be more challenging to repair surgically.
Warning Signs to Recognize
One of the most dangerous aspects of diabetic retinopathy is that it often produces no symptoms in its early stages. By the time you notice changes in your vision, the disease may already be advanced. As it progresses, common warning signs include:
- Floaters: spots or dark strings drifting across your field of vision, sometimes caused by small bleeds from fragile new blood vessels leaking into the vitreous
- Flashes of light: often a sign that the retina is being tugged or pulled
- Blurred or fluctuating vision: can come and go as fluid leaks and is reabsorbed
- Dark or empty patches: areas of your visual field that seem blocked or missing
- Sudden, severe vision loss: can signal a large vitreous hemorrhage or an active detachment
A sudden increase in floaters, new flashes of light, or a shadow creeping across your vision are urgent signs. These suggest the retina may be actively detaching or that significant bleeding is occurring inside the eye.
Who Is Most at Risk
Not everyone with diabetes will develop retinal detachment. The risk depends heavily on how well blood sugar is controlled and how long someone has had the disease. Keeping your HbA1c below 7 percent consistently reduces the risk of retinopathy progressing to its most dangerous stages. People with poor control (HbA1c above 9 percent) face a significantly steeper trajectory.
Among people who do develop proliferative diabetic retinopathy, the risk of tractional detachment within a year varies by severity. Those with mild proliferative disease have roughly a 1 to 2 percent chance, while those with high-risk proliferative retinopathy face about an 9 to 12 percent chance over the same period, based on pooled data from several large clinical trials. Other factors that accelerate progression include high blood pressure, kidney disease, high cholesterol, and long duration of diabetes.
How It’s Treated
Once a tractional retinal detachment occurs, surgery is the primary treatment. The standard procedure is a vitrectomy, where a surgeon removes the vitreous gel along with the scar tissue and fibrovascular membranes that are pulling on the retina. This releases the traction and allows the retina to settle back into place.
The results are generally encouraging. In one study of 69 eyes treated with vitrectomy for diabetic tractional detachment, the retina was successfully reattached in 98.6 percent of cases with a single surgery. Vision improved in about 88 percent of eyes, and was at least stabilized in another 7 percent. About 71 percent of patients achieved functional vision of 20/200 or better, which is the threshold for legal blindness, meaning most crossed above it. However, only about 23 percent reached 20/50 or better, which is closer to normal reading and driving vision.
These numbers reflect an important reality: surgery can save your vision and often improve it substantially, but the eye rarely returns to where it was before the damage began. The longer a detachment goes untreated, or the more advanced the retinopathy before surgery, the less visual recovery you can expect.
The Role of Injection Therapy
You may have heard of eye injections used to treat diabetic eye disease. These anti-VEGF injections work by blocking the signal that drives abnormal blood vessel growth. They’re a mainstay treatment for diabetic macular edema and proliferative retinopathy, and there has been concern that by causing scar tissue to contract as vessels shrink, they could inadvertently trigger a detachment.
A pooled analysis of five large randomized clinical trials found that this concern doesn’t hold up in practice. The one-year rate of tractional detachment was 4.8 percent in eyes receiving anti-VEGF injections compared to 6.8 percent in control eyes, a difference that wasn’t statistically significant. In other words, the injections did not increase detachment risk and may offer a slight protective effect, though the evidence isn’t strong enough to confirm that. These injections remain a valuable tool for managing the disease stages that precede detachment.
How Screening Prevents the Worst Outcomes
Because diabetic retinopathy is silent in its early stages, regular dilated eye exams are the single most important thing you can do to catch the disease before it reaches the point of detachment. How often you need screening depends on what’s already happening in your retina.
If you have diabetes but no signs of retinopathy, an exam every three to four years is reasonable, though many guidelines still recommend annual checks. Once mild retinopathy appears, the interval tightens to every one to three years depending on blood sugar control. At moderate retinopathy, exams every three to six months become important. And if you have advanced changes approaching the proliferative stage, you may need to be seen every one to three months. Someone with well-controlled blood sugar (HbA1c around 6 percent) can generally tolerate longer intervals at each stage, while someone running above 10 percent needs more frequent monitoring.
Keeping blood sugar in a healthy range, managing blood pressure and cholesterol, and showing up for scheduled eye exams are the most effective ways to prevent diabetes from ever reaching the point where the retina is at risk of detaching.