Thyroid eye disease — also called Graves’ orbitopathy — is one of the more interesting conditions in ophthalmology, because it links several eye problems into a single syndrome: bulging eyes, retracted eyelids, and double vision. It is an autoimmune disease, usually linked to the thyroid, with a characteristic course in two phases. This page explains what it is, its symptoms, and how it is treated in each phase.
What happens in the orbit
Behind each eye is an orbit filled with the muscles that move the eye and the fat that cushions it. In thyroid eye disease, the immune system mistakenly attacks these tissues, and they become inflamed and swollen. This swelling has three main results: it pushes the eye forward (bulging, exophthalmos), it pulls the eyelids upward (lid retraction, producing a “staring” look), and it stiffens the eye muscles so that they no longer move the eye fully — producing double vision.
In most cases the disease is accompanied by an overactive thyroid (Graves’ disease), but the eye disease has an independent course: it can appear before the thyroid is identified, after it, and even once thyroid function has already been controlled.
The symptoms
- Bulging eyes (exophthalmos) — the most characteristic appearance, sometimes in one eye more than the other.
- Eyelid retraction — a “wide” look, in which white is visible above or below the iris.
- Double vision — the functionally significant sign, arising from stiffening of the eye muscles (restrictive strabismus). On how double vision is rated, see double vision and strabismus.
- Dryness and irritation — when the eyelids do not close well over a bulging eye, the cornea is exposed and dries. See also dry eye.
- A serious warning sign — blurring or dimming of vision, which may indicate pressure on the optic nerve. This is an emergency.
Two phases, and this determines the treatment
This is the most important point in understanding the disease. It has an active phase (inflammatory), lasting months up to two years, in which the inflammation is at work and the state changes and worsens; and after it an inactive phase (stable), in which the inflammation subsides, the tissue scars, and the state plateaus. Treatment differs completely between the phases: in the active phase the aim is to quench the inflammation, and in the stable phase to rehabilitate what remains. Rehabilitative surgery in the active phase is a mistake, because the state is still moving.
Smoking — the factor in your control
Of all the risk factors, smoking is the only one within the patient’s control, and it is also the most significant. It worsens the course of the disease, increases its severity, and reduces the response to treatment. Stopping smoking, alongside controlling thyroid function, is the foundation on which every further treatment rests — and sometimes it alone changes the disease’s trajectory.
Treatment by phase
In the active phase. The foundation is controlling the thyroid and stopping smoking. In mild disease, lubrication and protecting the ocular surface are usually enough. In moderate-to-severe disease, drugs are used: teprotumumab, a relatively new drug that reduces the bulging of the eye and the double vision; corticosteroids given intravenously; and sometimes radiotherapy to the orbit. The treatment is chosen by the severity of the inflammation.
An emergency. Pressure on the optic nerve is treated urgently — with high-dose steroids or surgery to relieve the pressure in the orbit.
In the stable phase. Here rehabilitative surgery is performed, in a set order: first orbital decompression (making room to return the eye to its place), then strabismus surgery to align the eyes and correct the double vision, and finally eyelid correction. This order matters, because each stage affects the next.
The disability angle
Because the disease affects several planes, the disability rating is made from the impairments that remain, separately. Double vision is rated by the direction of gaze in which it appears, as explained in double vision and strabismus. Severe bulging of the eye, accompanied by a marked cosmetic defect or signs of corneal exposure, is also rated: at the National Insurance Institute, 10% for one eye or 15% for both (the Ministry of Defence schedule differs). The general framework for setting the rating is on eye disability assessment.
Bottom line
Thyroid eye disease is a syndrome that joins bulging, eyelid retraction and double vision into a single disease, on an autoimmune background. The key to understanding it is the two phases: in the active phase the inflammation is quenched with drugs, and in the stable phase what remains is rehabilitated by surgery. And the most significant thing within the patient’s control is simple — to stop smoking, because no treatment competes with the harm smoking adds. On other eye diseases, see eye diseases.
The information on this page is general and not a substitute for a personal examination and medical advice. Anyone noticing a bulging eye, double vision or sudden blurring is welcome to be examined by an ophthalmologist.
Frequently asked questions
What is thyroid eye disease?
It is an autoimmune disease in which the immune system attacks the tissues behind the eye — the eye muscles and the orbital fat. The swollen tissues push the eye forward (bulging), pull the eyelids upward (retraction) and stiffen the muscles, producing double vision. It usually appears alongside an overactive thyroid (Graves' disease), but the eye disease has a course of its own, and it can sometimes appear even when thyroid function is normal.
Why does smoking matter so much in this disease?
Smoking is the most important risk factor within the patient's control: it significantly worsens the course of the disease and reduces the response to treatment. Stopping smoking is the single most impactful step a patient can take themselves — alongside controlling thyroid function. These two are the foundation on which every further treatment rests.
When is thyroid eye disease an emergency?
When blurring or dimming of vision appears, or a fall in colour perception — these may indicate pressure on the optic nerve (optic neuropathy), a rare but sight-threatening complication that requires urgent treatment with steroids or surgery to relieve the pressure. Severe corneal damage from exposure, when the eyelids do not close, also requires prompt treatment.
How is the disease treated?
Treatment depends on the phase. In the active, inflammatory phase, the foundation is controlling the thyroid and stopping smoking, and in moderate-to-severe disease drugs are used — teprotumumab (a newer drug that reduces the bulging and the double vision), corticosteroids, or radiotherapy to the orbit. In the inactive, stable phase, rehabilitative surgery is performed in a set order: orbital decompression, then strabismus surgery, and finally eyelid correction.
