A detached retina is a serious eye condition where the thin layer of tissue lining the back of your eye pulls away from its normal position. This tissue, the retina, is responsible for converting light into the signals your brain reads as vision. When it separates from the layer of cells that supplies it with oxygen and nutrients, the affected tissue begins to die. Without treatment, a detached retina leads to permanent vision loss.
How Retinal Detachment Happens
Your retina sits against a layer of supportive cells at the back of your eye. Between the retina and the lens at the front is a gel-like substance called the vitreous, which fills most of the eyeball and helps it hold its shape. Under certain conditions, fluid or physical force can push or pull the retina away from its supportive layer, creating a gap. Once separated, the retina loses its blood supply and the light-sensitive cells start to break down.
There are three types of retinal detachment, each with a different cause:
- Rhegmatogenous detachment is the most common type. It starts with a tear, hole, or break in the retina. Liquified vitreous gel seeps through the break and collects behind the retina, gradually peeling it away. Aging is the leading cause, as the vitreous naturally shrinks and tugs on the retina over time.
- Tractional detachment happens when scar tissue forms on the retina’s surface and physically pulls it away from the back of the eye. There’s no tear involved. The most common cause is diabetic retinopathy, a complication of diabetes that damages blood vessels in the eye and triggers abnormal scar tissue growth.
- Exudative detachment also involves no tear. Instead, fluid leaks from blood vessels or inflammatory tissue and pools behind the retina, pushing it forward. Leaking blood vessels, tumors, or swelling in the back of the eye can all trigger this type.
Warning Signs to Recognize
A detached retina is painless, which makes it easy to dismiss the early warning signs. The three hallmark symptoms are a sudden increase in floaters (small dark spots, squiggly lines, or cobweb-like shapes drifting across your vision), flashes of light in one or both eyes, and a dark shadow or “curtain” creeping over part of your field of vision. The shadow typically starts at the edges and moves inward.
These symptoms can also appear with a less serious condition called posterior vitreous detachment, where the vitreous gel pulls away from the retina without tearing it. Posterior vitreous detachment is common with aging and usually harmless. The key difference is that it doesn’t cause a shadow over your vision or sudden vision loss. However, a vitreous detachment can sometimes cause a retinal tear, which then progresses to a full detachment. Any sudden onset of floaters or light flashes deserves prompt evaluation, because you can’t distinguish between the two on your own.
Who Is Most at Risk
Retinal detachment can happen at any age, but several factors raise the odds significantly. Severe nearsightedness is one of the strongest risk factors. People who need a prescription of negative 5 diopters or more (the threshold the World Health Organization uses for high myopia) face five to six times the risk of retinal detachment compared to those with mild nearsightedness. This is because highly nearsighted eyes are elongated, which stretches and thins the retina, making it more prone to tears.
Other risk factors include previous eye surgery (especially cataract removal), a history of retinal detachment in the other eye, a family history of the condition, and significant eye trauma. For tractional detachments specifically, poorly controlled diabetes is the primary driver.
Why Timing Matters
Retinal detachment is a time-sensitive emergency, and the critical factor is whether the center of the retina (the macula) is still attached. The macula handles your sharpest, most detailed vision, so its status largely determines how much sight you can recover.
When the macula is still attached, surgery is typically performed within 24 hours to prevent it from detaching. The risk of the macula peeling off while waiting for same-day surgery is very low, around 0.1 to 0.5 percent. When the macula has already detached, outcomes are significantly better if surgery happens within one to three days of central vision loss compared to four to six days. After 72 hours, the chances of recovering sharp central vision drop noticeably. This means even “macula-off” detachments should be treated urgently, not left for whenever a slot opens up.
How a Detached Retina Is Diagnosed
An eye doctor diagnoses a detached retina with a dilated eye exam, using drops to widen your pupil and then examining the retina with a bright light and magnifying instrument. This allows them to see any tears, holes, or areas of detachment directly. If there’s bleeding inside the eye that blocks the view, an ultrasound of the eye can map the retina’s position through the blood.
Treatment and Repair
The two types caused by tears or scar tissue (rhegmatogenous and tractional) almost always require surgery. Exudative detachments are sometimes managed by treating the underlying cause, such as reducing inflammation or addressing a tumor. For rhegmatogenous detachments, there are three main surgical approaches.
The first involves injecting a small gas bubble into the eye. The bubble presses the retina back into place while a laser or freezing probe seals the tear. This is the least invasive option and is suited for simpler detachments. The second approach places a small silicone band around the outside of the eye, gently pushing the wall of the eye inward toward the detached retina. This band stays in place permanently but isn’t visible. The third and most involved option removes the vitreous gel entirely, reattaches the retina, and fills the eye with a gas bubble or silicone oil to hold it in position while it heals.
What Recovery Looks Like
Recovery depends on which procedure you had, but the most demanding part for many patients is the positioning requirement. If a gas bubble was placed in your eye, you may need to keep your head in a specific position, often face-down, for much of the day and night. Some surgeons recommend face-down positioning for at least 50 minutes of every hour, including during sleep, for one to two weeks. Others require it for a shorter window of 24 hours followed by a week of less strict positioning. The gas bubble gradually dissolves on its own over several weeks.
During the weeks the gas bubble is present, you cannot fly or travel to high altitudes. Changes in air pressure cause the bubble to expand, which can dangerously raise the pressure inside your eye.
Vision After Surgery
The success rate for reattaching the retina with a single surgery is high. In a large 10-year Scottish study, 86 percent of patients did not experience a re-detachment after their initial repair. When the macula was still attached at the time of surgery, 93 percent of patients recovered enough vision to meet driving standards. When the macula had already detached, that number dropped to 65 percent, though vision in those patients continued to improve gradually for years after the procedure.
Even with successful reattachment, some people notice that their vision isn’t quite the same as before, particularly if the macula was involved. Colors may look slightly different in the affected eye, straight lines may appear mildly wavy, and overall sharpness may be reduced. The degree of recovery depends heavily on how quickly the detachment was repaired and how much of the retina was affected.