Retinal detachment happens when the thin layer of tissue lining the back of your eye pulls away from its normal position, separating from the blood vessels that supply it with oxygen and nutrients. There are three distinct types, each with a different underlying cause, but the most common one starts with a small tear in the retina that allows fluid to seep behind it. About 16 per 100,000 people experience this each year, with the highest rates in men over 50.
The Three Types of Retinal Detachment
Not all retinal detachments happen the same way. The type determines both the cause and how it’s treated.
Rhegmatogenous detachment is by far the most common. It begins with a tear or break in the retina. Once that opening exists, the gel-like fluid filling the center of your eye (the vitreous) seeps through the tear and collects behind the retina, gradually pushing it away from the back wall of the eye. Think of it like water getting under a sheet of wallpaper: the more fluid accumulates, the more the retina peels away.
Tractional detachment occurs when scar tissue growing on the retina’s surface contracts and physically pulls the retina away from its supporting tissue. There’s no tear involved. This type is most closely linked to advanced diabetes.
Exudative detachment happens when fluid builds up behind the retina without any tear at all. Inflammation, certain autoimmune diseases, or sometimes tumors cause blood vessels in and around the eye to leak, and the pooling fluid lifts the retina from below.
Aging and Vitreous Changes
The single biggest driver of rhegmatogenous detachment is the natural aging of the vitreous gel inside your eye. When you’re young, this gel is thick, stable, and firmly attached to the retina at multiple points. Over the decades, it gradually liquefies and its structural fibers clump together and collapse. Eventually, the gel pulls away from the retina entirely, a process called posterior vitreous detachment, or PVD.
PVD itself is extremely common and usually harmless. The problem arises when the vitreous doesn’t separate cleanly. If it’s still stuck firmly to certain spots on the retina while pulling away elsewhere, the traction can tear the retina. That tear becomes the entry point for fluid, and detachment can follow within hours or days. This is why the peak age for retinal detachment falls between 50 and 69: that’s when PVD is most likely to occur.
Nearsightedness and Structural Vulnerabilities
People with high myopia (severe nearsightedness) face a dramatically higher risk. Their eyes are physically longer than average, which stretches the retina thinner and makes it more vulnerable to tears. The risk of retinal detachment is five to six times greater in people with high myopia compared to those with mild nearsightedness.
A structural condition called lattice degeneration also raises risk. This involves thin, weakened patches in the peripheral retina, present in roughly 1 in 10 people. Most never have a problem, but by age 80, about 5% of people with lattice degeneration will have experienced a detachment from those weakened areas. The tears can form either as clean holes in the thinned tissue or from the vitreous tugging on the edges of a lattice patch.
Trauma to the Eye
A blow to the eye or head can cause retinal detachment directly. Blunt force compresses the eye, and the resulting shock wave can tear the retina or damage the structures holding it in place. Among people who sustain a closed globe injury (a blunt hit that doesn’t puncture the eye), the prevalence of retinal detachment is estimated at 70 to 86%.
Traumatic detachments often show up within hours to days of the injury, with sudden floaters, flashes of light, and blurred vision in the affected eye. But not always. Some detachments from trauma don’t appear until months or even years later, as gradual scar tissue formation or delayed vitreous changes eventually pull the retina free. This is why follow-up eye exams after significant eye injuries matter even when vision seems fine initially.
Diabetes and Scar Tissue
Advanced diabetic eye disease is the leading cause of tractional retinal detachment. Here’s the sequence: chronically high blood sugar damages the tiny blood vessels in the retina, starving patches of tissue of oxygen. The eye responds by growing new, abnormal blood vessels. These fragile vessels don’t just grow across the retina’s surface. They also burrow into the vitreous gel, creating firm adhesions between the vitreous and the retina.
As fibrous, contractile scar tissue develops alongside these new vessels, it begins pulling the retina in multiple directions, both forward and sideways. The combined force deforms the retina and eventually tears it away from the back of the eye. Unlike the clean tear-and-fluid mechanism of rhegmatogenous detachment, this is a slow, progressive process that correlates directly with how well blood sugar and diabetic eye disease are managed over time.
Inflammatory and Autoimmune Conditions
Exudative detachments are the least common type, but they’re linked to a surprisingly wide range of diseases. The underlying mechanism is always the same: inflammation or abnormal tissue causes fluid to leak from blood vessels and accumulate behind the retina.
The condition most strongly associated with exudative detachment is Vogt-Koyanagi-Harada disease, an autoimmune disorder that attacks pigmented cells throughout the body, including in the eye. People with this condition are over 100 times more likely to develop exudative detachment than those with other forms of eye inflammation. Other inflammatory conditions that raise risk include posterior scleritis (deep inflammation of the eye wall), sarcoidosis, lupus, Behçet disease, Crohn’s disease, ulcerative colitis, and rheumatoid arthritis. In rare cases, tumors behind the eye can also cause fluid buildup.
Previous Eye Surgery
Cataract surgery, the most common eye operation in the world, slightly increases the risk of retinal detachment afterward. One large study found a cumulative rate of about 0.4% over roughly five years of follow-up, which translates to about 2.4 times the natural background risk. The reason: removing the eye’s natural lens changes the vitreous environment, accelerating the gel’s separation from the retina. The risk is highest in the first year or two after surgery and is somewhat greater in younger patients and those who are already nearsighted.
Warning Signs That Signal a Problem
Retinal detachment itself is painless, which is part of what makes it dangerous. The warning signs come from the events leading up to it. When the vitreous tugs on the retina, it stimulates the light-sensitive cells there, producing brief flashes of light, usually in your peripheral vision. Floaters, those drifting spots or cobweb-like shapes, appear when tiny clumps of vitreous or blood cast shadows on the retina.
A sudden shower of new floaters, flashes of light (especially in one eye), or a shadow or curtain creeping across your field of vision are the classic triad. These symptoms don’t always mean detachment, but they do mean something is happening at the retina’s surface that needs to be evaluated urgently. A retinal tear caught before it progresses to full detachment can often be sealed with a quick laser or freezing procedure in a clinic, preventing detachment entirely.
Why Timing Matters for Vision Recovery
The center of the retina, called the macula, is responsible for sharp, detailed vision. Whether the macula has detached, and for how long, is the strongest predictor of how well you’ll see after treatment. When the macula is still attached at the time of repair, final vision is typically excellent. Remarkably, even if the macula detaches but surgery happens within three days, visual outcomes are nearly as good as if it had never detached at all.
After that window, outcomes decline. People whose macula was detached for four to seven days before surgery had measurably worse vision than those treated sooner, and those who waited eight days or longer had significantly poorer results. This is why retinal detachment is treated as an urgent condition. The retina can survive being separated from its blood supply for a limited time, but every day of delay reduces the chances of full visual recovery.