Retinal detachment happens when the thin layer of tissue lining the back of your eye pulls away from its normal position. This separates it from the blood vessels that supply it with oxygen and nutrients. It affects roughly 7 to 10 people per 100,000 each year, making it uncommon but serious. Left untreated, it leads to permanent vision loss in the affected eye.
There are several distinct ways this can happen, ranging from age-related changes inside the eye to physical trauma, diabetes complications, and inherited conditions. Understanding the specific pathways helps clarify who’s most at risk.
The Most Common Type: Tears and Breaks
The vast majority of retinal detachments are rhegmatogenous, meaning they start with a tear or hole in the retina. The process typically begins with something called posterior vitreous detachment, a natural age-related change where the gel filling your eyeball starts to shrink and liquefy. As this gel (the vitreous) pulls away from the retina, it can tug hard enough to rip a small hole in the tissue.
Once a tear forms, liquefied vitreous seeps through the opening and collects behind the retina. That fluid gradually pushes the retina away from the back wall of the eye, like water getting under a wallpaper seam. The detachment usually starts at the tear site and spreads outward. This can happen over hours to days, or progress more slowly over weeks depending on the size and location of the tear.
Posterior vitreous detachment itself is extremely common. About 53% of people over age 50 have it, and by the late 70s and 80s, that number rises to roughly 63%. Most people who experience vitreous detachment never develop a retinal tear. But in a large study of over 1,000 patients who showed up with new flashes and floaters, about 10% of those with confirmed vitreous detachment had a retinal tear or detachment. That’s high enough to take those symptoms seriously.
Tractional Detachment From Scar Tissue
Tractional retinal detachment works differently. Instead of fluid sneaking through a hole, scar tissue on the retina’s surface physically pulls it away from the back of the eye. There’s no tear involved. The retina is yanked forward by bands of fibrous tissue that contract over time.
This type is most closely associated with advanced diabetes. In proliferative diabetic retinopathy, the retina becomes starved of oxygen, which triggers abnormal blood vessels to grow across its surface. These fragile new vessels are accompanied by contractile fibrous tissue that tugs on the retina in multiple directions. The traction frequently causes those weak new vessels to bleed into the eye, and it can deform and detach the retina entirely.
Exudative Detachment Without a Tear
The third type, exudative detachment, involves neither a tear nor scar tissue. Instead, fluid builds up behind the retina from inflammation, infection, or abnormal blood vessels leaking beneath it. Conditions that can trigger this include severe eye inflammation, certain autoimmune diseases, and tumors in or behind the eye. The accumulating fluid pushes the retina forward, detaching it from its support layer.
Who’s at Higher Risk
Severe Nearsightedness
People with high myopia (strong nearsightedness, typically a prescription of -6.00 or worse) face five to six times the risk of retinal detachment compared to people with mild nearsightedness. Highly nearsighted eyes are physically longer than normal, which stretches the retina thinner and makes it more vulnerable to tears. The vitreous also tends to liquefy earlier in life in myopic eyes, accelerating the process that leads to detachment.
Age
Most rhegmatogenous detachments occur in people over 50, driven by the natural breakdown of the vitreous gel. The older you are, the more likely the vitreous has already separated from the retina, and the window of risk for tearing is during that separation process.
Previous Eye Surgery
Cataract surgery slightly increases the risk. In one study tracking patients for an average of about five years after surgery, the overall rate of retinal detachment was 0.39%, which is low but still higher than the general population’s baseline. The risk is thought to increase because removing the eye’s natural lens changes the vitreous dynamics inside the eye, sometimes accelerating vitreous detachment.
Connective Tissue Disorders
Stickler syndrome, an inherited condition affecting collagen, carries a dramatically elevated risk. In the most common genetic form (COL2A1), 47% of patients develop retinal detachment. Even in the less common form (COL11A1), the rate is 28%. These numbers dwarf the general population risk and are why people with Stickler syndrome need regular retinal monitoring starting in childhood.
Eye Trauma
A blow to the eye, whether from a ball, fist, airbag, or fall, can cause immediate retinal tears or detachment. Symptoms typically appear within hours to days of the injury. However, traumatic retinal detachment can also show up months or even years later, as scar tissue from the original injury gradually contracts and pulls on the retina.
Family History and Previous Detachment
If a close family member has had a retinal detachment, your own risk is elevated. If you’ve already had a detachment in one eye, the other eye carries a higher lifetime risk as well, since both eyes typically share the same structural characteristics.
Warning Signs to Recognize
Retinal detachment itself is painless, which is part of what makes it dangerous. The warning signs are visual, not sensory. The classic trio includes a sudden increase in floaters (small dark spots or squiggly lines drifting through your vision), flashes of light in your peripheral vision (especially noticeable in dim lighting), and a shadow or curtain creeping across part of your visual field.
Floaters and flashes on their own are common and usually harmless, often caused by normal vitreous changes. But a sudden burst of new floaters, particularly combined with light flashes, is the symptom pattern that signals a possible retinal tear. In the prospective study of patients presenting with these symptoms, nearly 1 in 10 had a tear or detachment requiring treatment. The key word is “sudden.” A few long-standing floaters you’ve had for years are a different situation from dozens of new ones appearing over an afternoon.
The curtain or shadow effect usually means the detachment has already progressed. At that point, the retina in one area has lifted far enough that the corresponding part of your visual field goes dark. This is an emergency. The sooner the retina is reattached, the better the odds of preserving vision, particularly if the central retina (the macula) hasn’t yet detached.
How Detachment Progresses Without Treatment
A retinal tear doesn’t always progress to full detachment, but once fluid starts accumulating behind the retina, gravity and eye movement tend to extend the separation. The retina can’t function when it’s lifted away from its blood supply. Cells in the detached area begin to deteriorate within hours, and the longer the detachment persists, the more permanent the damage.
If the macula (responsible for sharp central vision, reading, and recognizing faces) detaches, visual outcomes after repair are significantly worse than if surgery happens before the macula lifts. This is why the timeline matters so much. A small tear caught early can often be sealed with a brief laser or freezing procedure in an office setting. A full detachment with macular involvement requires major surgery and may still result in some permanent vision loss even with a successful repair.