Your eyes feel gritty, puffy, and strangely prominent. You notice that people keep asking if you are tired, even when you have had a full night of sleep. These changes might seem minor at first, and it’s easy to blame them on stress or the Singapore heat. But for some people, symptoms like these are the earliest warning signs of Thyroid Eye Disease, a condition that may escape attention in the early stages without timely specialist care.
Thyroid Eye Disease (TED) is an autoimmune disorder where the body’s own immune system erroneously targets the tissue surrounding the eyes, triggering inflammation, swelling, and various changes to vision and eye appearance. It is most commonly associated with Graves’ disease, a form of overactive thyroid, though it can occasionally occur in people with an underactive thyroid or even normal thyroid function. Research led by doctors from the National University of Singapore found that the overall pooled prevalence of thyroid eye disease among people with Graves’ disease is around 40%, and the prevalence in Asia is notably higher at approximately 44%, making it a fairly common condition in this part of the world.
What actually happens to the eyes?
To understand the symptoms, it helps to understand what is happening beneath the surface. In TED, the immune system produces antibodies that target receptors in the tissue and fat surrounding the eye socket. This triggers inflammation, causing the muscles and fatty tissue behind the eyes to swell. Because the eye socket is a rigid bony space, this swelling has nowhere to expand into but forward, so the eyes get pushed forward and the optic nerve that connects the eye to the brain also possibly comes under pressure.
This process happens in two phases. The first is the active phase, during which inflammation is at its peak and symptoms tend to worsen. This phase can last anywhere from six months to 1-2 years. The second is the stable or inactive phase, where the inflammation settles down, though some physical changes may remain permanent without treatment.
The symptoms to watch for
Thyroid Eye Disease does not look the same in everyone, and symptoms can range from mild to severe. That said, there are several signs that appear consistently enough to serve as useful indicators.
- Eyes that appear to be bulging or protruding
This is one of the most recognisable features of TED. Known medically as proptosis or exophthalmos, it occurs when the swollen tissue behind the eye pushes it forward. A Singapore study of TED patients found proptosis to be one of the most common presenting signs.
- Eyelid retraction
Many people with TED notice that their upper eyelid sits higher than it should, giving their eyes a wide, staring appearance. In some patients, this may lead to incomplete eye closure, particularly when combined with proptosis.
- Redness and irritation
The whites of the eyes may appear red or inflamed, and the eyes may feel persistently gritty, dry, or watery. This may be due to the inflammatory processes in the active phase or possibly related to the cornea being more exposed to the air as a result of incomplete eye closure. It could also be due simply to congestion of swollen tissues within a tight socket.
- Puffiness and swelling around the eyes
The eyelids and surrounding tissue may look swollen or baggy, particularly in the mornings. Many people initially mistake this for tiredness or fluid retention.
- Double vision
As the eye muscles become inflamed and swollen, they lose their ability to move the eyes smoothly and in coordination. This can result in diplopia, or double vision, which can be disorienting and affect day-to-day activities.
- Sensitivity to light
Increased light sensitivity, particularly when outdoors, is another symptom that TED patients frequently report.
- Reduced or blurred vision
In more serious cases, the optic nerve can become compressed by the swollen tissue, leading to changes in colour perception or a decline in overall vision. This is considered a sight-threatening complication and requires urgent assessment.
The eye changes seen in TED do not always appear at the same time as thyroid problems. Some people develop eye symptoms before they know anything is wrong with their thyroid gland, and others experience TED after their thyroid condition has already been treated. If you notice any of these signs and you have a history of thyroid disease, an eye assessment should be your next step.
Who is at greater risk?
While TED can affect anyone with an autoimmune thyroid condition, certain factors increase the likelihood of developing more severe symptoms.
- Being male – Although TED is more common in women, men who develop it often have a more severe presentation.
- Age – the condition can occur at any age but tends to be more severe when it develops in older adults.
- Smoking – this is one of the most significant modifiable risk factors; smokers with Graves’ disease are far more likely to develop TED, and their disease tends to be more aggressive.
- Stress – high stress levels are associated with worse disease; stress management is therefore important in bringing TED under control
- Poorly controlled thyroid levels – fluctuating thyroid hormone levels can worsen eye disease, making thyroid management a vital component of care.
How is thyroid eye disease diagnosed?
Diagnosis is typically made through a combination of a thorough clinical eye examination, imaging (such as an MRI or CT scan of the orbits), and blood tests to assess thyroid function and antibody levels. An experienced oculoplastic specialist will evaluate the degree of eyelid retraction or protrusion, the health of the cornea, the movement of the eye muscles, and whether the optic nerve shows any signs of pressure.
It is important that TED is not assessed in isolation. Because it sits at the intersection of thyroid medicine and ophthalmology, the best outcomes come from a coordinated approach between an endocrinologist managing the thyroid condition and an eye specialist managing the ocular aspects.
Conclusion
When treatment is initiated at an early stage, patients can achieve better healing outcomes and improved results.
Thyroid Eye Disease is a condition where early recognition is important in preventing progression to severe disease. Detecting it during the active phase opens the door to treatments, including anti-inflammatory therapies that can preserve both comfort and vision. Waiting until symptoms are severe can make management more complex and the recovery journey longer.
If you have noticed changes to the appearance of your eyes, are experiencing persistent irritation or double vision, or have a known thyroid condition and want to be proactive, an assessment with a specialist is an important step to take.
At Ava Eye Clinic, our team has extensive experience in the diagnosis and management of Thyroid Eye Disease. We take a careful, personalised approach as no two patients present in exactly the same way. If you have concerns about your eye health, do get in touch with us today. Early understanding of this complex condition and how best to navigate this TED journey is vital for optimal outcomes.