Posterior Uveitis: Protecting Your Sight From Inflammation at the Back of the Eye
Understanding Posterior Uveitis
Posterior uveitis is one of the more serious forms of eye inflammation because it directly threatens the structures responsible for central and detailed vision. Understanding what is happening inside the eye helps patients make sense of their diagnosis and the treatment plan ahead.
The uvea is the middle layer of the eye. It is made up of three parts: the iris at the front, the ciliary body in the middle, and the choroid at the back. The choroid supplies blood and nutrients to the outer layers of the retina. When the choroid becomes inflamed, the entire visual system can be affected.
Uveitis is named based on which part of the uvea is affected. Anterior uveitis, which involves the front of the eye, often causes noticeable redness and pain. Posterior uveitis is different because the choroid and retina do not have pain-sensing nerves. This means serious inflammation can develop gradually with few obvious warning signs.
In posterior uveitis, inflammation can harm the eye in more than one way. Inflammatory cells may invade the supportive tissue of the choroid, or they may attack the fine network of blood vessels closest to the retina, called the choriocapillaris. Both processes can damage the outer blood-retinal barrier, a protective boundary that keeps the retina healthy. When this barrier breaks down, fluid may leak under the retina. Abnormal new blood vessels, a complication known as choroidal neovascularization, may also develop and cause additional damage.
Causes and Risk Factors
Posterior uveitis has a wide range of possible causes, and identifying the correct cause is essential for choosing the right treatment. Our specialists take a thorough approach to determine whether the source is infectious, autoimmune, or related to another systemic condition.
Infections are among the most common causes of posterior uveitis worldwide. Toxoplasmosis, a parasitic infection, is a leading infectious trigger and can produce retinal scarring that leads to lasting vision loss. Other infectious causes include herpes viruses, cytomegalovirus (CMV), tuberculosis, and syphilis. Identifying and treating the specific organism is essential because the treatment approach differs completely from that used for non-infectious uveitis.
Non-infectious posterior uveitis occurs when the body's own immune system attacks eye tissue. Several systemic diseases are known to trigger this response.
- Sarcoidosis, a condition that causes clusters of inflammatory cells in various organs
- Behcet disease, which involves inflammation of blood vessels throughout the body
- Vogt-Koyanagi-Harada (VKH) syndrome, an autoimmune disease affecting pigmented tissues including the choroid
- Birdshot chorioretinopathy, a chronic inflammatory condition involving the retina and choroid
- Multifocal choroiditis, which occurs most often in women between the ages of 20 and 60
A prior history of uveitis or eye infections raises the likelihood of recurrence. People with weakened immune systems, whether from medication or underlying health conditions, are more vulnerable to infectious forms. Posterior uveitis can occur at any age, and certain subtypes are more common in specific age groups or populations.
Recognizing the Symptoms
The symptoms of posterior uveitis can develop slowly and may be easy to dismiss at first. Knowing what to look for helps you seek care before serious damage occurs.
Most people with posterior uveitis notice changes in their vision rather than pain or redness. Common symptoms include the following.
- Blurry or hazy vision
- Floaters, which appear as spots, strings, or cobwebs drifting across your field of view
- Blind spots or dark areas in your vision
- Sensitivity to light, also called photophobia
These symptoms may affect one eye or both, and they can come and go before becoming more persistent.
Unlike anterior uveitis, posterior uveitis often causes little to no eye pain. Because the choroid and retina lack pain-sensing nerves, many patients only notice visual changes. This absence of pain can be misleading and may delay the decision to seek care. Any unexplained or persistent change in vision deserves prompt evaluation by a specialist.
Some symptoms suggest a serious complication such as retinal detachment or a severe inflammatory event. Seek emergency eye care right away if you experience any of the following.
- A sudden curtain or shadow falling across part of your vision
- A rapid increase in the number of floaters
- Sudden or severe blurring of vision
- Sudden loss of vision in one eye
These symptoms should never be waited on. Prompt treatment can make a significant difference in the outcome.
Diagnosis and Testing
Diagnosing posterior uveitis requires a thorough examination of the back of the eye combined with specialized imaging and, in most cases, laboratory testing. Our retina specialists use advanced diagnostic tools to get a complete picture of what is happening.
The evaluation begins with a dilated eye exam, in which eye drops are used to widen the pupil so the back of the eye can be seen clearly. The specialist looks for signs of inflammation such as white or yellow spots on the choroid or retina, fluid under the retina, changes in the blood vessels, and areas of scarring. Both eyes are examined because some forms of posterior uveitis affect both sides simultaneously.
Several imaging tests provide detailed information about the extent of inflammation and how the eye is responding to treatment.
- Optical coherence tomography (OCT) creates detailed cross-sectional images of the retina and can detect swelling, fluid accumulation, and structural changes
- Fluorescein angiography (FA) uses a dye injected into a vein to photograph blood flow in the retina and identify leaking or blocked vessels
- Indocyanine green angiography (ICG) provides images of the deeper choroidal blood flow and helps detect inflammation beneath the retinal pigment epithelium
- Fundus autofluorescence is a non-invasive technique that highlights areas of damage to the retinal pigment epithelium
Because posterior uveitis is often connected to infections or systemic disease, blood tests and other laboratory studies are commonly ordered. Testing can screen for tuberculosis, syphilis, toxoplasmosis, sarcoidosis, and various autoimmune markers. In many cases, our retina specialists coordinate care with a rheumatologist or infectious disease specialist to identify and manage the underlying cause.
Treatment Options
Treatment for posterior uveitis depends on whether the cause is infectious or non-infectious, how severe the inflammation is, and which structures are affected. Our specialists build individualized treatment plans aimed at controlling inflammation and protecting long-term vision.
Corticosteroids are a core treatment for non-infectious posterior uveitis because they reduce inflammation quickly. For inflammation at the back of the eye, injections placed directly into or around the eye are often more effective than eye drops. Ozurdex (dexamethasone intravitreal implant) is an FDA-approved option that releases medication slowly over approximately three to four months. Oral corticosteroids may be used for severe or bilateral (both-eye) disease, though long-term use carries systemic side effects that require careful monitoring.
For chronic conditions such as birdshot chorioretinopathy or multifocal choroiditis, medications that reduce the activity of the immune system are typically started early to limit long-term dependence on steroids. These are called immunosuppressive or steroid-sparing agents. Common options include methotrexate and mycophenolate mofetil. These medications can take several months to reach their full effect, so early initiation is important for protecting vision over time.
Adalimumab is currently the only FDA-approved biologic medication for noninfectious intermediate, posterior, and panuveitis (inflammation that affects the entire uvea). It works by blocking a protein called tumor necrosis factor (TNF) that drives the inflammatory response. Adalimumab is typically used when other immunosuppressive treatments have not provided adequate control or when a patient cannot tolerate those medications.
When an infection is identified as the cause, treatment must target the specific organism. Toxoplasmosis is treated with antiparasitic medications. Tuberculosis-related uveitis requires a full course of anti-tuberculosis drugs. Herpes-related or CMV-related inflammation is treated with antiviral medications. Controlling the infection is an essential step before or alongside any anti-inflammatory therapy, since suppressing the immune response without treating an active infection can make the infection worse.
When posterior uveitis leads to choroidal neovascularization (the growth of abnormal blood vessels beneath the retina), anti-VEGF (vascular endothelial growth factor) injections may be recommended. These medications block the signals that drive abnormal vessel growth and leakage. Options include bevacizumab, aflibercept, and ranibizumab, and the choice depends on each patient's specific situation and medical history.
Potential Complications and Visual Outcomes
When posterior uveitis is not adequately controlled, it can lead to serious and sometimes permanent changes to vision. Understanding the possible complications helps patients recognize why consistent treatment and follow-up are so important.
Several complications can arise from uncontrolled or recurring inflammation in the back of the eye.
- Macular edema, which is swelling in the central retina and one of the most common causes of vision loss in uveitis
- Choroidal neovascularization, where abnormal blood vessels grow under the retina and can leak or bleed
- Cataracts, which can develop from inflammation itself or as a side effect of long-term corticosteroid use
- Glaucoma (elevated pressure inside the eye), which can result from inflammation or from corticosteroid treatment
- Retinal scarring that causes permanent blind spots
Managing posterior uveitis is often a long-term process that requires regular follow-up visits. Imaging tests such as OCT may be repeated at each appointment to track changes in the retina and assess how well treatment is working. Some patients need ongoing care for months or years, especially those with autoimmune-related forms. The goal throughout is to control inflammation, prevent complications, and preserve as much vision as possible.
Even when inflammation appears well controlled, regular monitoring continues. Flare-ups can occur without warning, and catching them early allows treatment to begin before significant damage takes place. Our specialists schedule follow-up visits based on the type and severity of each patient's uveitis, ranging from every few weeks to every few months.
Living With Posterior Uveitis
Day-to-day life with posterior uveitis involves staying aware of your symptoms, keeping appointments, and working closely with your care team. With the right support, many patients are able to maintain functional vision and a good quality of life.
Patients should pay close attention to changes that may signal a recurrence of inflammation. New floaters, increased blurriness, or heightened light sensitivity are all signs worth reporting promptly. It is important not to dismiss these symptoms, especially if they come on suddenly. Contacting your specialist at the first sign of change gives you the best chance of minimizing any damage.
Consistency with medication is one of the most important things a patient can do to protect their sight. This is especially true for immunosuppressive medications, which need to be taken regularly to maintain their effect. Stopping these medications without guidance from your specialist can lead to a rapid return of inflammation. Any concerns about side effects or tolerability should be discussed openly so your care team can adjust the plan if needed.
Because posterior uveitis is often connected to systemic conditions, patients may work with a team of providers. A rheumatologist can help manage autoimmune conditions like sarcoidosis or Behcet disease. An infectious disease specialist may be involved when tuberculosis or other infections are part of the picture. Clear communication between all treating providers ensures that care remains coordinated and that the full picture of your health is considered.
Frequently Asked Questions
These answers address common questions that go beyond what is covered above, including practical guidance on what to do in specific situations.
Yes, and whether it does depends on the underlying cause. Forms linked to autoimmune conditions such as Vogt-Koyanagi-Harada syndrome or sarcoidosis commonly involve both eyes, sometimes simultaneously. Other types, like toxoplasmosis-related choroiditis, more typically affect one eye at a time. Because involvement can develop in the other eye over time, your specialist will examine both eyes at every visit even if only one has shown symptoms so far.
This depends heavily on the cause. Infectious posterior uveitis may resolve once the underlying infection is treated, though follow-up monitoring continues to watch for recurrence. Autoimmune-related forms often require months to years of immunosuppressive therapy, and some patients benefit from long-term low-dose treatment to prevent flare-ups. Your specialist will adjust the plan based on how your eye responds over time, so the duration is rarely fixed from the start.
Long-term immunosuppressive therapy does carry risks, including increased susceptibility to infections and potential effects on the liver, kidneys, or blood cell counts. However, these medications are carefully managed with regular blood tests and check-ins. For many patients with chronic posterior uveitis, the risk of uncontrolled inflammation causing irreversible vision loss is greater than the risks of the medication itself. Your specialist will continuously weigh these factors and make adjustments as needed.
New or worsening floaters, a sudden shadow over part of your vision, or a rapid decrease in visual clarity should be treated as urgent, especially if you have a known history of posterior uveitis. Contact your eye specialist right away or go to an emergency eye care facility. These symptoms can indicate retinal detachment, a severe inflammatory flare, or another complication that requires prompt treatment to prevent permanent damage. Do not wait to see if the symptoms resolve on their own.
Many patients with posterior uveitis maintain usable, functional vision with proper and consistent management. The key factors are how early the condition is diagnosed, how well inflammation is controlled over time, and whether complications are caught and treated quickly. Some degree of visual change may be irreversible if significant scarring has already occurred, which is why early intervention matters so much. Your care team will work with you to set realistic expectations and monitor your vision closely throughout treatment.
Expert Posterior Uveitis Care at Rhode Island Eye Institute
Our retina specialists at Rhode Island Eye Institute bring subspecialty training and advanced diagnostic technology together to provide thorough, compassionate care for patients with posterior uveitis. We understand that this condition can feel overwhelming, and we are here to guide you through every step of the process, from diagnosis to long-term management. If you are experiencing unexplained visual symptoms or have been referred for evaluation, we encourage you to schedule an appointment with our team so we can work together to protect your vision.