Thyroid Eye Disease (Graves' Ophthalmopathy)

What happens in thyroid eye disease

In Graves' disease, antibodies stimulate the TSH receptor on the thyroid, causing hyperthyroidism. The same receptor, along with the IGF-1 receptor, is present on cells (fibroblasts) behind the eyes. When activated, these cells cause inflammation, swelling of the eye muscles and fat, and production of substances that draw in water.

Because the eye socket is a rigid bony box, swelling pushes the eyes forward (proptosis) and can stiffen the eye muscles, causing double vision. In severe cases, swollen muscles compress the optic nerve at the back of the socket.

Risk factors

• Graves' disease, especially in the first 18 months after diagnosis
• smoking, the strongest modifiable risk factor; it increases risk and severity and reduces response to treatment
• radioactive iodine treatment for hyperthyroidism, which can worsen TED (steroid cover may be given)
• uncontrolled thyroid levels, both high and low
• high levels of TSH receptor antibodies
• female sex; older men tend to have more severe disease

Symptoms

• gritty, sandy, dry or watery eyes (dry eyes)
• redness of the eyes and lids
• puffy, swollen eyelids
• eyelid retraction: upper lids pulled up, giving a staring or startled look
• proptosis: eyes bulging forward
• pain or pressure behind the eyes, especially with eye movement
• double vision, often first when looking up or to the side
• light sensitivity
• difficulty closing the eyes fully, especially during sleep
• in severe cases: blurred vision and loss of color vision

Activity and severity

Doctors assess two features:

• Activity: whether the disease is actively inflamed, using a Clinical Activity Score (pain, redness, swelling). Active disease responds to anti-inflammatory treatment.
• Severity: mild, moderate-to-severe, or sight-threatening (optic nerve compression or corneal breakdown).

The active phase typically lasts 6 months to 3 years before burning out, often leaving some changes.

Diagnosis

• eye examination by an ophthalmologist: lid position, eye protrusion measured with an exophthalmometer, eye movements, vision, color vision, optic nerve and corneal health
• thyroid function tests and TSH receptor antibodies
• CT or MRI of the orbits to show enlarged muscles and nerve compression

Treatment

For everyone

• Stop smoking, the most important step
• Get thyroid levels normal and stable, coordinated with the endocrinologist
• Lubricating eye drops by day and gel or ointment at night
• Sunglasses, raising the head of the bed to reduce morning puffiness
• Taping the lids closed at night if they do not close

Mild disease

• Selenium supplements for 6 months can improve mild, active TED in people with low selenium levels
• Supportive measures; most improve over time

Moderate-to-severe active disease

• Intravenous glucocorticoids (methylprednisolone) weekly for 12 weeks, the long-standing first-line treatment
• Teprotumumab: an IGF-1 receptor blocker given by IV infusion every 3 weeks for 8 doses; FDA-approved and effective at reducing eye bulging and double vision. Side effects include muscle cramps, high blood sugar and hearing changes.
• Mycophenolate, tocilizumab, rituximab, and orbital radiotherapy in selected cases

Sight-threatening disease

• urgent high-dose IV steroids
• orbital decompression surgery if optic nerve compression does not improve quickly

Rehabilitative surgery (inactive phase)

Once the disease has been stable for at least 6 months, surgery can restore function and appearance, in this order:

1. orbital decompression to reduce bulging
2. eye muscle (strabismus) surgery for double vision
3. eyelid surgery to correct retraction and puffiness

Prisms in glasses help with mild double vision in the meantime.

Outlook

Most people have mild disease that improves. Moderate-to-severe TED can have a significant impact on vision, appearance and quality of life, but newer treatments and staged surgery give good results. Relapse after the inactive phase is uncommon.

Frequently asked questions

What are the first signs of thyroid eye disease?

Early signs include gritty, dry or watery eyes, redness, light sensitivity, puffy eyelids and a staring look from upper lid retraction. Eyes may then bulge forward, and double vision can develop. Anyone with Graves' disease and these symptoms should see an eye specialist.

Can thyroid eye disease happen with normal thyroid levels?

Yes. Most people with TED have Graves' hyperthyroidism, but some have normal thyroid function or Hashimoto's hypothyroidism. The eye disease is driven by the immune system, not by thyroid hormone levels themselves.

Will my eyes go back to normal?

Inflammation, redness and swelling often improve as the active phase ends. Bulging and double vision may partly persist, but treatments such as teprotumumab and later surgery can significantly improve appearance and function.

Does smoking make thyroid eye disease worse?

Yes. Smoking greatly increases the risk of developing TED, makes it more severe, and reduces the effectiveness of treatment. Stopping smoking is one of the most important steps you can take.