About Graves' Ophthalmopathy (Thyroid Eye Disease)

Overview

Graves’ ophthalmopathy, also known as Graves' eye disease, is an autoimmune condition that occurs in individuals with an overactive thyroid gland due to Graves' disease. It is characterized by the inflammation and swelling of tissues, muscles, and fat behind the eye socket. This swelling can cause various eye symptoms, including:

• Proptosis: Abnormal protrusion of the eye from the socket
• Eyelid retraction: The eyelids may retract or appear elevated
• Exophthalmos: Bulging eyes
• Eye redness and irritation
• Double vision (diplopia)
• Eye pain or discomfort
• Decreased vision or blurred vision

In severe cases, the swollen tissues can compress the optic nerve, leading to vision impairment. The exact cause of Graves’ ophthalmopathy is not fully understood, but it is believed to involve an immune response targeting the tissues around the eyes. Treatment options include managing the underlying thyroid condition, using medications to reduce inflammation, and in some cases, surgical intervention.

Causes and Risk Factors

The disease causes of Graves' ophthalmopathy (GO) is not fully understood, but several factors contribute to its development.

GO is caused by:

• Autoimmune reactions: Abnormal immune response triggers inflammation and remodeling of orbital tissues, leading to symptoms such as eyelid retraction, exophthalmos (bulging eyes), and exposure keratitis.
• Activation and proliferation of orbital fibroblasts: Sensitive T cells (a type of immune cell) and autoantibodies (proteins that attack the body’s own tissues) target specific antigens, which can lead to activation and growth of orbital fibroblasts (cells in the eye area), resulting in swelling (edema) and scarring (fibrosis) of the tissues that control eye movement.
• Oxidative stress: Suspected as a contributing factor, oxidative stress may play a role in the development of GO.

Non-modifiable risk factors for GO cannot be changed or controlled. These include:

• Genetic influences: There is evidence suggesting a genetic predisposition to autoimmune diseases, including GO.
• Gender: Females have a higher risk of developing GO than males.

Modifiable risk factors for GO can be influenced or changed. These include:

• Smoking: Individuals with Graves' disease who smoke are more likely to develop GO and experience more severe symptoms compared to non-smokers.

It's important to note that these risk factors do not guarantee the development of GO. If you have concerns about your risk or symptoms, it's best to consult with your healthcare professional for personalized advice.

Symptoms

Common symptoms of Graves’ ophthalmopathy include:

• Dryness, grittiness, and irritation in the eyes
• Pressure and pain in the eyes
• Redness and inflammation of the eyes
• Retracting eyelids
• Bulging of the eyes (proptosis or exophthalmos)
• Light sensitivity
• Double vision (diplopia)

As Graves’ ophthalmopathy progresses or reaches higher severity, additional symptoms may occur, such as:

• Trouble moving or closing the eyes
• Exposure and ulceration of the cornea
• Compression of the optic nerve

It's important to note that Graves' ophthalmopathy often affects both eyes, but in some cases, it may only affect one eye. During active inflammation, symptoms can worsen for up to 6 months, followed by an inactive phase where symptoms stabilize or start to improve. Remember to consult with your healthcare professional for personalized advice.

Diagnosis

To diagnose Graves' ophthalmopathy, the following examinations, tests, and procedures are commonly performed:

• Ophthalmic examination: This includes checking how well the eyes move (ocular motility), exophthalmometry (measurement of eye protrusion), intraocular pressure (IOP) measurement, slit lamp examination, and fundoscopy.
• Blood tests: A blood test may be done to check the levels of thyroid-stimulating hormone (TSH) and thyroid hormones. High levels of thyroid hormones and low TSH levels are often seen in Graves' disease.
• Thyroid ultrasound: An imaging test like ultrasound may be ordered to get a detailed look at the thyroid gland.
• Graves' antibodies test: This blood test checks for the presence of Graves' antibodies, although it is not necessary for diagnosis.

Additional examinations and tests may include:

• Orbital MRI (magnetic resonance imaging): This imaging test provides detailed information about the muscles around the eyes showing their size, thickness, and how they appear on the scan (such as brightness or patterns). This helps doctors look for swelling, inflammation, or other issues affecting these muscles.
• Radionuclide scanning: This test can help differentiate Graves' disease from other causes of hyperthyroidism but is contraindicated for certain patients.
• Optical coherence tomography angiography (OCTA): This noninvasive technique can be used to detect changes in the blood vessels in and around the center of the retina (the foveal and parafovea). Lt shows details like how dense the blood vessels are, helping doctors identify problems with blood flow or damage.

It's important to consult with a doctor who can evaluate your specific situation and recommend the appropriate examinations and tests for an accurate diagnosis and assessment of Graves' ophthalmopathy.

Treatment Options

The goals of treatment for Graves’ ophthalmopathy are to relieve ocular pain, reduce diplopia (double vision), preserve vision, and improve cosmetic appearance. Here are the different types of treatments and how they work to achieve these goals:

• Medications:
  • Glucocorticoids: These are the mainstay of treatment for active moderate to severe GO. They help reduce inflammation and suppress the immune response.
  • Teprotumumab: This medication is approved for active thyroid eye disease and has shown to reduce symptoms of GO, such as eye bulging and double vision.
  • Eye drops: Non-redness remover or preservative-containing drops can help with dry, irritated eyes.
• Therapies and Therapeutic Procedures
  • Orbital radiotherapy: Rarely used, this therapy involves radiation to reduce swelling in the muscles and tissues around the eyes.
  • Intensity modulated radiation therapy (IMRT): This technique is used in radiotherapy for GO patients, aiming to alleviate clinical symptoms.
• Sel-care and health behavior changes:
  • Lubricating gels: Applied before bedtime, these gels can relieve dryness if eyelids don't fully close.
  • Sunglasses: Wearing sunglasses can help with light sensitivity and protect the eyes from wind or direct heat.
  • Prescription glasses with prisms: These may correct double vision in some cases.
  • Cool compress: Gently pressing a cool compress on or around the eyes can provide temporary relief from irritation.

Remember, treatment options should be discussed with a healthcare professional as they can provide personalized advice based on your individual situation.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.