IgG4-related ophthalmic disease (IgG4-ROD)

Swelling around the eyes can happen for many different reasons. For some, the reason is a rare immune condition known as IgG4-related disease (IgG4-RD).

When IgG4-RD affects the tissues around the eyes, it’s known as IgG4-related ophthalmic disease (IgG4-ROD). You may also hear it referred to as orbital IgG4-RD disease, IgG4-RD eye disease, or IgG4-related eye disease.

Knowing how this condition affects the eyes, what symptoms doctors look for, and how it’s diagnosed and treated may help protect your vision.

What is IgG4-related ophthalmic disease?

In IgG4-RD, the immune system can trigger inflammation in various organs and tissues.

When this disease affects the eye, it can cause tumor-like swelling in ophthalmic tissues due to the infiltration of immune cells. IgG4-ROD commonly affects the lacrimal (tear) glands, the muscles that move the eyes, and nearby facial nerves.

It’s still unclear exactly why or how IgG4-ROD develops. Studies show that immune system overactivation plays a role by sending too many immune cells into tissues around the eyes. These cells, which include plasma cells that produce IgG4 antibodies (immune proteins), build up in the tear glands and eye muscles.

Over time, this can lead to inflammation and swelling, as well as thickened tissue that forms lesions in the orbital (eye) area.

Symptoms of IgG4-related ophthalmic disease

Symptoms of IgG4-ROD, especially those related to swelling, may develop slowly and affect one or both eyes. It is estimated that about 60% of people with IgG4-ROD have symptoms in or around both eyes.

The lacrimal gland is the most commonly affected area, involved in up to 86% of cases. Soft tissues, nerves, the eyelids, and orbital bones may also be affected.

Common IgG4 eye symptoms may include:

• puffy or swollen eyelids, often from enlarged tear glands
• dry or irritated eyes if tear production is affected
• bulging of the eye (proptosis) caused by swelling of the eye socket
• double vision when inflamed muscles affect eye movement
• blurred vision or vision changes due to swelling or inflammation of nearby structures

Some people with IgG4-ROD may also develop firm masses in the eye socket. These growths aren’t cancer, but they can look similar on scans. This is one reason why the condition can take some time to diagnose correctly.

How doctors diagnose IgG4-related ophthalmic disease

Unfortunately, there’s no single test that can definitively diagnose IgG4-ROD. Instead, your doctor will put together a full picture by reviewing your symptoms, imaging scans, blood tests, and, often, a tissue sample (biopsy).

Receiving a diagnosis might include the following tests:

• an eye exam and medical history to check for patterns such as tear gland swelling, restricted eye movement, double vision, or vision loss
• imaging scans to look for enlarged lacrimal glands, eye muscles, nerves, or orbital masses
• blood tests to measure IgG4 levels
• a biopsy to look for tissue changes and IgG4-positive plasma cells

It is important to note that IgG4-ROD doesn’t appear the same way in everyone, which makes diagnosis more difficult. However, early detection and treatment are critical for preventing serious vision complications down the line.

Treatment options for eye disease in IgG4-RD

Treating IgG4-ROD is about reducing inflammation, protecting vision, and lowering the risk of recurrence. It’s important to begin treatment as quickly as possible, especially if your optic nerves, eye muscles, or other key tissues are involved.

Treatment options include:

• Steroids: Often the first-line treatment
• Steroid-sparing immunosuppressants: May be used when symptoms return or when longer-term control is needed
• Biologic treatment: Therapies that target immune B-cells (including plasma cells that produce IgG4) or specific immune factors and may help in harder-to-treat or relapsing IgG4-ROD

Many people may have their symptoms return after steroid use and may require long-term immunosuppressants. Surgery is not routine, but may be used in select cases, such as when there’s pressure on an optic nerve.

When to seek urgent care

Contact a healthcare provider right away if you notice sudden vision loss, fast-growing swelling around the eye, severe eye pain, or new double vision. These signs can mean that inflammation or a mass is pressing on the optic nerve.

Without timely treatment, this can lead to permanent vision loss. Early care can reduce the risk of serious complications or the need for more intensive treatments later.