Choroidal Detachment: Causes, Symptoms, and Treatment
Understanding Choroidal Detachment
The choroid is a spongy layer of blood vessels that lines the back wall of the eye. It sits between the retina (the light-sensitive tissue at the back of the eye) and the sclera (the white outer wall of the eye). The choroid plays a critical role in delivering oxygen and nutrients to the outer half of the retina.
In a healthy eye, the choroid lies directly against the sclera with essentially no space between them. When fluid or blood collects in the thin potential space between these two layers, the choroid lifts away from the sclera. This separation is called a choroidal detachment.
There are two main types of choroidal detachment based on what fills the space between the choroid and the sclera.
- Serous choroidal detachment: Clear fluid (serum) accumulates in the space between the choroid and the sclera. This type is usually associated with low eye pressure and tends to cause only mild discomfort.
- Hemorrhagic choroidal detachment: Blood collects in the space due to rupture of choroidal blood vessels. This type is often more painful and may be associated with high eye pressure.
Choroidal detachment is best understood through the balance of pressures inside the eye. Normally, the pressure inside the eye keeps the choroid pressed firmly against the sclera. When this balance is disrupted, fluid can seep into the space between these layers.
Low eye pressure, known as hypotony, is the most common trigger. Hypotony allows fluid from choroidal blood vessels to leak into the surrounding tissue. Inflammation can also drive fluid into this space. Once a choroidal detachment forms, it can further lower eye pressure by reducing the eye's production of fluid, which may worsen the detachment.
Who Is Affected and Risk Factors
Serous choroidal detachments most commonly occur after eye surgery, particularly glaucoma filtering surgery (trabeculectomy). In some cases, eyes with low pressure following glaucoma surgery can develop serous or hemorrhagic choroidal detachment months or even years after the procedure. Modern surgical techniques, including sutured wound closure and careful wound management during cataract surgery, have significantly reduced the rate of this complication.
The incidence of intraoperative choroidal detachment during small-gauge vitrectomy (a minimally invasive retina surgery) is low. In a study of 1,026 consecutive patients who underwent small-gauge vitrectomy, six cases of intraoperative choroidal detachment were identified, with retraction of the infusion cannula and acute low eye pressure as the main causes (Nature Eye, 2021).
Several medical conditions and medications can increase the risk of choroidal detachment.
- Glaucoma, a condition where fluid buildup in the eye damages the optic nerve
- Use of blood thinners (anticoagulants), antiplatelet drugs, or clot-dissolving (thrombolytic) agents
- Use of antimetabolites, especially mitomycin C, which is sometimes applied during glaucoma surgery
- Use of aqueous suppressants, medications that reduce fluid production inside the eye
Beyond surgery and medications, a number of other factors can lead to choroidal detachment. Eye trauma, inflammatory diseases, infections, and tumors within the eye can all disrupt the normal fluid balance and cause the choroid to separate. Certain drug reactions and venous congestion (blockage of blood flow out of the eye) are additional potential causes.
Sudden decompression of the eye during surgery, particularly when the eye pressure is elevated at the start of the procedure, also raises the risk. Patients who are farsighted may be more susceptible, and in rare cases, serous choroidal detachments can occur spontaneously without any clear trigger.
Choroidal detachment can occur alongside retinal detachment. In one study, the incidence of rhegmatogenous retinal detachment (a type of retinal detachment caused by a tear in the retina) accompanied by choroidal detachment was 8.6 percent. The risk was significantly higher in patients with macular holes or retinal breaks located behind the equator of the eye (PMC, 2016). Longer eye length and complete retinal detachment may also be potential risk factors for developing choroidal detachment in this setting.
Signs and Symptoms
The symptoms of choroidal detachment vary widely. Some patients feel nothing at all. Others notice that the eye is achy and sore. In more severe cases, pain can be intense and may be accompanied by nausea and vomiting.
Blurred vision is common, though the degree of blurring depends on several factors. Other eye issues that often accompany choroidal detachment, such as recent surgery or abnormal eye pressure, can also affect how clearly you see.
Serous choroidal detachments tend to produce milder symptoms. They are usually associated with low eye pressure and only mild discomfort. Hemorrhagic choroidal detachments, on the other hand, are commonly painful. They are often linked to high intraocular pressure and can cause more severe visual disturbance.
A retina specialist examining the eye may find additional signs associated with choroidal detachment. These can include a serous retinal detachment (fluid collecting beneath the retina), a very shallow anterior chamber (the space behind the cornea at the front of the eye), and secondary angle closure (a condition where the drainage angle of the eye becomes blocked, raising eye pressure).
Diagnosis and Testing
A retina specialist can often detect choroidal detachment during a dilated eye exam. After placing drops in the eye to widen the pupil, the specialist uses specialized instruments to view the inside of the eye. Choroidal detachments appear as smooth, dome-shaped elevations of the choroid.
Measuring the intraocular pressure is an important part of the evaluation. Low pressure suggests a serous detachment, while high pressure may indicate a hemorrhagic type or secondary angle closure.
Ultrasound of the eye (B-scan ultrasonography) is one of the most useful tools for confirming a choroidal detachment. This painless test uses sound waves to create images of the structures inside the eye. It can help distinguish between serous and hemorrhagic detachments and determine the size and extent of the separation.
Optical coherence tomography, or OCT (a non-invasive imaging test that creates cross-sectional pictures of the retina), may also be used to evaluate the retina and look for associated fluid beneath the retinal layers.
Because choroidal detachment can result from many different conditions, your retina specialist will work to identify the underlying cause. This may involve reviewing your surgical history, checking for signs of inflammation or infection, and evaluating your medications. In some cases, additional blood tests or imaging may be needed to rule out tumors or systemic diseases.
Treatment Options
Most choroidal detachments are initially treated with medications. The primary goals are to reduce inflammation, manage eye pressure, and relieve pain.
- Topical corticosteroid eye drops help control inflammation inside the eye.
- Cycloplegic eye drops, such as atropine (a drop that relaxes the muscles inside the eye and dilates the pupil), help reduce pain and stabilize the structures at the front of the eye.
- If intraocular pressure is elevated, a topical beta blocker or other pressure-lowering medication may be prescribed.
- Oral pain relievers may be recommended for discomfort.
Small choroidal detachments that develop after eye surgery often resolve on their own within a few days to weeks. During this time, a retina specialist will monitor the eye closely to ensure the detachment is improving and that no complications are developing. Frequent follow-up visits may be needed to check eye pressure, inflammation levels, and the status of the detachment.
In cases where a serous choroidal detachment is caused by persistently low eye pressure from a leaking surgical wound, the underlying problem must be corrected. This may involve placing additional sutures at the surgical site or using other techniques to seal the wound and restore normal eye pressure.
When a choroidal detachment does not respond to medical treatment, or when it is large or hemorrhagic, surgical drainage may be required. During this procedure, a retina specialist makes a small opening in the sclera to allow the trapped fluid or blood to drain from beneath the choroid.
The timing of surgical drainage depends on several factors. These include the status of the structures inside the eye, the intraocular pressure, the type of detachment (serous versus hemorrhagic), and how long the detachment has been present. Prompt intervention may improve outcomes in severe cases.
What to Expect
Many patients with small, serous choroidal detachments recover well with medical treatment alone. Vision often improves as the fluid reabsorbs and the choroid settles back against the sclera. Recovery time varies depending on the size of the detachment, the underlying cause, and whether additional eye conditions are present.
It is important to use all prescribed eye drops as directed and attend all follow-up appointments. Missing doses or skipping visits can delay healing or lead to complications.
For patients who require surgical drainage, recovery may take longer. Inflammation and discomfort are common in the days following the procedure. Your retina specialist will prescribe medications to manage these symptoms and will schedule regular follow-up exams to track your progress.
Research shows that choroidal detachment following modern trabeculectomy has favorable long-term outcomes for both visual acuity and eye pressure control (Journal of Glaucoma, recent studies). However, early postoperative serous choroidal detachment after trabeculectomy has been associated with a lower rate of surgical success and higher mean postoperative eye pressure in some patients (Ophthalmology research, recent studies). Long-term follow-up is essential to prevent chronic low eye pressure and to detect any late complications.
Living with Choroidal Detachment
During recovery, pay attention to any changes in your vision or comfort level. Keep a simple log of how your vision looks each day. This can help your retina specialist understand how you are progressing between office visits.
If you notice a sudden worsening of vision, increasing pain, new flashes of light, or a shadow or curtain across your field of vision, contact a retina specialist or go to the emergency room immediately. These could be signs of a worsening detachment or a new retinal problem.
While recovering from a choroidal detachment, follow your retina specialist's instructions regarding physical activity. Heavy lifting, straining, and bending over may be restricted, especially after surgery. Avoid rubbing the affected eye. If you take blood thinners or other medications that may have contributed to the detachment, your retina specialist may work with your primary care doctor to adjust these.
Dealing with an eye condition that affects your vision can be stressful. It is normal to feel anxious about your recovery and long-term eyesight. Asking questions at every visit and making sure you understand your treatment plan can help ease some of that worry. Support from family, friends, or patient support groups can also make the process easier.
When to See a Retina Specialist
If you have recently had eye surgery, particularly glaucoma surgery, cataract surgery, or vitrectomy, be aware of the possibility of choroidal detachment. Report any new eye pain, achiness, blurred vision, or changes in how the eye feels to your surgeon or a retina specialist promptly.
Seek immediate care from a retina specialist or go to the emergency room if you experience any of the following symptoms:
- Sudden, severe eye pain
- A sudden decrease in vision
- A shadow, curtain, or dark area across your field of vision
- Nausea or vomiting along with eye pain
These symptoms may indicate a hemorrhagic choroidal detachment, a retinal detachment, or another serious eye emergency that requires urgent evaluation.
Patients with a history of choroidal detachment, especially those who have had glaucoma surgery, should maintain regular follow-up visits with a retina specialist. Some choroidal detachments can recur months or years after surgery. Long-term monitoring helps catch any changes early and protects your vision over time.
Questions and Answers
In many cases, especially with small serous choroidal detachments, vision returns to its prior level once the detachment resolves. However, larger or hemorrhagic choroidal detachments carry a higher risk of lasting visual effects. The outcome depends on the size of the detachment, how quickly it is treated, and whether other eye problems, such as retinal detachment, develop at the same time. Early detection and treatment give the best chance for a good visual outcome.
No. Although both involve a layer of tissue separating from its normal position inside the eye, they affect different structures. A retinal detachment involves the retina pulling away from its supporting tissue. A choroidal detachment involves the choroid pulling away from the sclera. The two conditions can sometimes occur together, which may complicate treatment, but they are distinct diagnoses that require different management approaches.
Choroidal detachment has historically been one of the more common complications of glaucoma filtering surgery. However, the rate has decreased significantly with modern surgical techniques, including sutured flap closure and tighter wound management. When choroidal detachment does occur after trabeculectomy, research suggests that long-term outcomes for vision and eye pressure control can still be favorable, though close follow-up is essential to detect and address any problems early.
No. Many choroidal detachments, particularly small ones that occur after surgery, resolve with medical treatment alone. Eye drops to reduce inflammation and dilate the pupil, along with pressure-lowering medications when needed, are often sufficient. Surgery is typically reserved for cases that do not improve with medical therapy, for large detachments, or for hemorrhagic detachments where blood must be drained. Your retina specialist will determine the best approach based on the specifics of your condition.
Choroidal detachment in children is uncommon but can occur, particularly in those with certain congenital eye conditions. In a study of pediatric patients with chorioretinal colobomas (a developmental gap in eye structures present from birth), the combined prevalence of retinal or choroidal detachment was 10.4 percent of patients and 8.1 percent of affected eyes (American Journal of Ophthalmology, 1998). Children with known eye abnormalities should have regular exams with an eye specialist to monitor for complications.