Scleritis
Understanding Scleritis
Scleritis is a serious inflammatory condition of the sclera, the tough white outer layer of the eye, that causes deep eye pain and can threaten your vision if left untreated. According to a 2024 StatPearls review, scleritis has an estimated prevalence of approximately 6 per 100,000 people in the United States, and up to 50% of cases are associated with an underlying systemic autoimmune condition (StatPearls, 2024). Although relatively uncommon, scleritis often signals an underlying systemic condition that requires prompt evaluation and coordinated care. At Greenwich Ophthalmology Associates, our ophthalmologists provide thorough diagnostic evaluations and personalized treatment plans for patients throughout the greater NY/CT region who are experiencing this condition. Understanding scleritis, its causes, and the available treatment options can help you take the right steps toward protecting your eye health.
The sclera is composed of thick collagen bundles and provides structural support and protection for the delicate internal structures of the eye. Unlike many other tissues, the sclera lacks its own direct blood supply and depends on the choroid and deep episcleral vascular plexus for nourishment. When inflammation affects this tissue, it can disrupt the eye's structural integrity and potentially lead to serious complications.
Scleritis typically develops when the body's immune system triggers an inflammatory response within the scleral tissue. This process activates the complement system and increases the recruitment of immune cells, including macrophages and T cells. The resulting inflammation involves both the deep and superficial vascular networks of the eye, producing the characteristic deep redness and pain associated with the condition.
Scleritis most frequently affects adults between the ages of 40 and 60, and it occurs more often in women than in men. Individuals with autoimmune conditions such as rheumatoid arthritis, lupus, or granulomatosis with polyangiitis (formerly known as Wegener granulomatosis) face a higher risk. The condition can affect one or both eyes and may occur as a single episode or as a recurring problem.
What Causes Scleritis
The causes of scleritis range from autoimmune conditions to infections, though in some cases no specific cause is identified. Pinpointing the underlying trigger is essential for guiding appropriate treatment. Roughly half of all scleritis cases are linked to an underlying autoimmune or systemic inflammatory disease. Rheumatoid arthritis is the most common systemic association, present in approximately 8 to 15 percent of patients with scleritis. Other associated conditions include systemic lupus erythematosus, inflammatory bowel disease, and various forms of vasculitis such as granulomatosis with polyangiitis.
Although less common, scleritis can result from bacterial, viral, or fungal infections. Herpes simplex keratitis and herpes zoster are among the viral infections that may trigger scleral inflammation. Infectious scleritis sometimes develops following eye surgery or trauma, making prompt evaluation of any post-surgical eye pain essential.
In some patients, scleritis occurs without an identifiable underlying cause, and these cases are classified as idiopathic. Even when no systemic condition is initially detected, we work closely with rheumatologists and internal medicine physicians to monitor for autoimmune diseases that may emerge over time.
Symptoms of Scleritis
The symptoms of scleritis tend to develop gradually and are typically more severe than those associated with other causes of eye redness. Recognizing these symptoms early is important for preserving your vision. Severe, deep, boring eye pain is the hallmark symptom of scleritis. The pain often radiates to the forehead, jaw, or sinuses and may wake you from sleep. The affected eye is usually tender to the touch, and the discomfort tends to worsen with eye movement.
Scleritis produces an intense redness that often has a characteristic bluish or purplish hue, distinguishing it from the brighter red appearance seen with conjunctivitis or pink eye. This deeper discoloration reflects the involvement of both the superficial and deep episcleral blood vessels. The redness does not blanch with the application of topical decongestant drops, which is a helpful clinical sign during examination.
Some patients experience blurred vision or a noticeable decrease in visual clarity as the condition progresses. Vision changes are more common in severe or posterior forms of scleritis, where inflammation may affect the retina or optic nerve. Any sudden change in vision alongside eye pain should prompt an urgent evaluation.
Scleritis may also cause excessive tearing, light sensitivity (photophobia), and a feeling of pressure within the eye. These symptoms can overlap with other eye infections and inflammatory conditions, making professional evaluation important for an accurate diagnosis.
How Scleritis Differs from Episcleritis
Scleritis and episcleritis can appear similar at first glance, but they are distinct conditions with very different implications for your eye health. Knowing the differences can help you understand why the correct diagnosis matters. Episcleritis involves the episclera, a thin tissue layer sitting between the conjunctiva and the sclera. This inflammation is superficial and generally benign. Scleritis, by contrast, involves the sclera itself, the denser and deeper structural layer of the eye. This deeper inflammation is what makes scleritis a more serious condition requiring systemic treatment.
Episcleritis typically causes mild discomfort or a gritty sensation, and it does not significantly affect vision. Scleritis causes severe, deep pain that can be debilitating and may interfere with sleep. The intensity and quality of pain is one of the most reliable indicators that inflammation has reached the scleral layer rather than remaining superficial.
Episcleritis is often self-limiting and may resolve on its own or with mild topical treatment over one to two weeks. Scleritis nearly always requires systemic therapy, including oral anti-inflammatory medications, and may need immunosuppressive drugs for long-term management. It is important to note that episcleritis does not progress to scleritis, so having episcleritis does not place you at higher risk for developing the more severe condition.
Because the treatment approaches differ significantly, distinguishing between scleritis and episcleritis is critical. Our ophthalmologists use a combination of clinical examination, slit-lamp evaluation, and sometimes imaging to determine the exact depth and extent of inflammation. Misdiagnosing scleritis as episcleritis can delay necessary treatment and increase the risk of permanent complications.
How Scleritis Is Treated
Treatment for scleritis focuses on controlling inflammation, relieving pain, and addressing any underlying systemic condition. The approach is tailored to the type and severity of your scleritis. Oral nonsteroidal anti-inflammatory drugs (NSAIDs) are the first-line treatment for non-necrotizing anterior scleritis. Medications such as indomethacin, ibuprofen, or naproxen are commonly prescribed to reduce inflammation and manage pain. We typically monitor your response over one to two weeks before considering additional therapies if symptoms persist.
If NSAIDs do not provide adequate relief, oral corticosteroids may be added to your treatment plan. These medications are effective at quickly reducing severe inflammation and are typically tapered gradually over six to eight weeks. In certain cases, corticosteroid injections around the eye (subconjunctival or sub-Tenon injections) may be used for more targeted treatment.
For patients with necrotizing scleritis, recurrent episodes, or cases linked to systemic autoimmune disease, immunosuppressive medications such as methotrexate, mycophenolate, or azathioprine may be necessary. Biologic agents that target specific parts of the immune response can also be considered for cases that do not respond to standard immunosuppressive therapy. These treatments require close coordination between our ophthalmologists and your rheumatologist or internist to balance effectiveness with safety.
Because scleritis is frequently associated with systemic disease, identifying and managing the root cause is a key part of treatment. In many cases, effectively treating the underlying autoimmune condition leads to significant improvement in scleral inflammation as well. Comprehensive blood work and systemic evaluation are important steps in the overall care process.
Surgery for scleritis is rare and reserved for cases involving scleral perforation or severe thinning that threatens the structural integrity of the eye. When needed, the sclera may be reinforced using preserved donor sclera, periosteum, or fascia lata. Any necessary cataract surgery is typically postponed until the scleritis has been in remission for at least two to three months to reduce the risk of recurrent inflammation.
Frequently Asked Questions
Diagnosis begins with a thorough eye examination using slit-lamp biomicroscopy to evaluate the depth of redness and tissue involvement. B-scan ultrasonography is particularly useful for detecting posterior scleritis, which may not be visible during a standard exam. Blood tests to screen for autoimmune conditions, infections, and inflammatory markers are typically included in the workup, and we may coordinate additional testing with your primary care physician or rheumatologist.
Scleritis is broadly divided into anterior and posterior types. Anterior scleritis, the most common form, is further classified as diffuse, nodular, or necrotizing. Necrotizing anterior scleritis is the most severe subtype and carries the highest risk of vision-threatening complications. Posterior scleritis affects the back of the eye and accounts for roughly 10 percent of all cases. A rare painless variant called scleromalacia perforans involves necrotizing changes without significant inflammation and is most often seen in patients with long-standing rheumatoid arthritis.
Yes, scleritis can lead to vision loss if it is not treated promptly. Possible complications include scleral thinning, corneal involvement such as peripheral ulcerative keratitis, cataract formation, secondary glaucoma, and retinal or optic nerve damage. Necrotizing and posterior forms carry the greatest risk. With timely diagnosis and appropriate treatment, many patients are able to preserve good functional vision.
Scleritis has one of the strongest associations with systemic autoimmune disease among all eye conditions. A new diagnosis of scleritis may sometimes be the first clinical sign of an undetected systemic illness, which is why we recommend a comprehensive systemic workup for every patient. Ongoing communication between your eye doctor and other specialists helps ensure that both the ocular inflammation and any underlying condition are managed together.
You should seek prompt evaluation any time you experience deep, persistent eye pain accompanied by redness, especially if the redness has a bluish or violet tinge. Pain that wakes you from sleep, worsens over several days, or occurs alongside vision changes warrants urgent attention. Early evaluation allows us to distinguish scleritis from other conditions and begin treatment before complications develop.
The duration of treatment varies depending on the type and severity of scleritis and whether an underlying systemic condition is present. Mild cases may respond to oral NSAIDs within a few weeks, while more severe or recurrent cases may require several months of corticosteroid or immunosuppressive therapy. Patients with associated autoimmune disease often need long-term management to prevent recurrence and protect their vision over time.
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