What Causes Retinal Tears?

A retinal tear happens when the thin layer of light-sensitive tissue at the back of your eye pulls away from the wall it is attached to. The most common cause is a posterior vitreous detachment, a normal age-related change in which the gel filling the eye shrinks and separates from the retina. If that gel stays stuck to the retina in spots, it can tug hard enough to rip the tissue. A tear is a medical emergency because fluid can seep through the opening and peel the retina off the back of the eye, a condition called retinal detachment that can cause permanent vision loss if it is not treated quickly.

What Causes Retinal Tears?

The vitreous is a clear gel that fills the inside of the eye and presses against the retina, holding it flat against the back wall. As people age, the gel gradually shrinks and becomes more liquid. Eventually it separates from the retina and collapses toward the center of the eye. This is called posterior vitreous detachment, or PVD.

For most people, PVD happens without any problem. But in some eyes, the vitreous stays firmly attached to the retina in one or more places. As the gel pulls away, those stuck spots tug on the retina and can tear it. The tear is mechanical — a physical rip in the tissue, not a disease process.

PVD becomes more common with age, and it is very common in older adults. Not everyone who has PVD develops a tear. The risk comes from how tightly the vitreous is attached and whether that attachment breaks cleanly or tears the retina as it lets go.

What Makes a Retinal Tear More Likely?

Several factors raise the odds that a PVD will tear the retina instead of separating cleanly.

• Nearsightedness (myopia). Eyes that are longer than average stretch the retina thinner, and the vitreous tends to detach earlier in life.
• Age. The vitreous changes with time, so risk rises as people get older.
• Prior eye surgery. Cataract surgery and other eye procedures can change how the vitreous behaves.
• Eye injury. A direct blow to the eye or head can pull the vitreous loose suddenly.
• Family history. A close relative with retinal detachment or tears increases your risk.
• Certain retinal conditions. Some inherited or inflammatory conditions weaken the retina and make it easier to tear.

These factors stack. Someone who is nearsighted, older, and has had cataract surgery faces a higher chance than someone with none of those traits.

What Does a Retinal Tear Feel Like?

There is no pain. The retina has no pain receptors, so a tear itself does not hurt. The warning signs are visual and usually sudden.

The most common symptom is a burst of new floaters — small specks, cobwebs, or threads that drift across your vision. These appear because tiny blood vessels in the retina can bleed when it tears, releasing cells into the vitreous. Along with floaters, many people see flashes of light. These flashes are caused by the vitreous tugging on the retina, which triggers the retina to send a signal the brain reads as light.

A shadow or curtain moving across part of your vision is a red flag. It often starts at the edge of your sight and creeps inward. That shadow usually means the retina has already begun to detach, and it needs immediate attention.

One important point: floaters and flashes are extremely common and most of the time they are harmless. The issue is that you cannot tell from the symptoms alone whether a tear has happened. That is why new or sudden changes in floaters or flashes need a prompt dilated eye exam.

How Is a Retinal Tear Diagnosed?

An eye doctor finds a tear by looking at the retina directly. This requires dilating your pupils with drops so the doctor can see the full retina, including the far edges where tears most often form.

The exam is quick and painless, though your vision will be blurry and light-sensitive for a few hours afterward. In some cases the doctor uses a technique called scleral depression, gently pressing on the outside of the eye to bring the peripheral retina into view. Tears often hide at the edges, so this step matters.

If the view is unclear or a tear is suspected but not seen, the doctor may use imaging such as optical coherence tomography or ultrasound. These tools help confirm the diagnosis and check whether the retina has started to detach.

Can a Retinal Tear Be Treated?

Yes. A tear that is caught before the retina detaches can usually be sealed, and this is why timing matters so much. Two procedures are commonly used.

Laser photocoagulation uses a focused laser to create small burns around the tear. Scar tissue forms and welds the retina to the wall beneath it, closing off the opening. Cryopexy does the same thing using extreme cold instead of heat. Both are typically done in the office and take only minutes.

These treatments do not repair vision that has already been lost, and they do not remove floaters. Their purpose is to prevent fluid from getting under the retina and causing a detachment. Whether a specific tear needs treatment depends on its size, location, and whether it is causing symptoms — some small, asymptomatic tears are monitored rather than treated. That decision is made by an eye specialist based on the exam.

If the retina has already detached, more involved surgery is needed, and outcomes depend heavily on how quickly it is done. This is the reason a new shadow in your vision should never wait until morning if you can be seen sooner.

Can You Prevent a Retinal Tear?

There is no proven way to prevent a retinal tear caused by a normal posterior vitreous detachment. The process is a natural part of aging for many eyes, and no diet, supplement, or exercise has been shown to stop it.

What you can do is act on the warning signs. Getting a dilated exam quickly when you notice a sudden increase in floaters, new flashes, or a shadow in your vision gives treatment the best chance to work. People with higher risk — those who are very nearsighted, have had eye surgery, or have a family history — should mention these factors to their eye doctor so the retina gets a careful look at routine visits.

Protecting your eyes from injury also matters. Wearing eye protection during sports, yard work, and tasks that involve flying debris reduces the chance of a traumatic tear.

Why Timing Changes the Outcome

A retinal tear and a retinal detachment are not the same problem, and the gap between them is where vision is saved or lost.

When only a tear is present, treatment seals it and the retina stays in place. Once fluid passes through the tear and lifts the retina off the back wall, the tissue loses its blood supply and stops working. Cells in the retina can be damaged within days, and the longer the detachment lasts, the less vision tends to come back after surgery — even when the surgery itself goes well.

This is why the symptoms matter more than they might seem to. A flash of light or a new floater is easy to dismiss. A shadow creeping across your vision is not. The difference between those two moments is often the difference between a quick office procedure and major surgery with an uncertain result.