Thyroid eye disease (TED) gives the eyes a wide, staring appearance. The most recognizable feature is eyes that look like they’re bulging forward out of their sockets, often with visible white above or below the colored part of the eye. But TED doesn’t always look that dramatic, and its appearance changes depending on whether the disease is in its active inflammatory phase or has settled into a more stable state.
The Staring, Wide-Eyed Look
The hallmark of TED is a combination of two things: the eyeballs pushing forward (called proptosis) and the upper eyelids pulling higher than normal (called eyelid retraction). Together, they create an unmistakable look. Historical clinical descriptions capture it vividly: eyes “so protruded that one could see the sclera above and below the cornea,” with lids spread so far apart that they couldn’t fully close, even during sleep.
In milder cases, you might just notice that more white is showing above the iris than usual, giving someone a startled or intense expression. The upper eyelid sits abnormally high, exposing a strip of white that’s normally hidden. In more advanced cases, the eyes protrude noticeably, and the lids may not fully close even with effort. This gap between the lids can make the eyes look unnaturally round and open.
Redness, Swelling, and Puffy Eyelids
TED isn’t just about bulging. During the active phase, the eyes often look inflamed. The white of the eye becomes visibly red, with dilated blood vessels especially noticeable on the inner and outer sides. The clear membrane covering the white of the eye can swell and become boggy or jelly-like, a condition called chemosis that makes the eye look watery and puffy.
The eyelids themselves swell and redden. Many people with active TED develop a puffy, baggy look around the eyes that can be mistaken for allergies or lack of sleep. The small pink bump in the inner corner of the eye (the caruncle) may also become inflamed and swollen. All of this gives the eye area a congested, irritated appearance that goes well beyond simple tiredness.
Early Signs Before the Bulging
TED doesn’t start with dramatic bulging. The earliest changes are often subtle: slightly puffy eyelids, dry or teary eyes, a gritty sensation, and light sensitivity. You might notice frequent blinking or that your eyes look a bit more “open” than usual in photos. Some people develop mild redness or a feeling of pressure behind the eyes before any visible protrusion occurs. These early symptoms can easily be dismissed, which is why TED sometimes progresses before it’s recognized.
One Eye or Both?
Most people picture TED as affecting both eyes equally, but that’s not always the case. About 10 to 11% of patients have truly unilateral disease, where only one eye is visibly affected. Roughly 31% have noticeably asymmetric involvement, meaning both eyes are affected but one looks significantly worse than the other. When TED appears in just one eye, it can be harder to diagnose because it mimics other conditions like an orbital tumor. The overall effect on someone’s face, though, is the same: a lopsided or uneven look to the eyes that wasn’t there before.
Active Phase vs. Stable Phase
TED looks different depending on which stage it’s in. The active phase typically lasts one to three years. During this time, the eyes are at their most inflamed. Pain, swelling, redness, and increasing bulging are all worsening. The eyes may look angry and irritated, with visible puffiness around the lids and prominent blood vessels across the white of the eye. Double vision can develop as the muscles behind the eyes swell and stiffen, pulling the eyes out of alignment.
Once the disease burns out and enters the stable (also called inactive or fibrotic) phase, the redness and swelling fade. But the structural changes often remain. Scarring locks the muscles and fat behind the eyes into their new positions, so the bulging, eyelid retraction, and any eye misalignment tend to persist. The eyes no longer look inflamed, but they may still look permanently different from how they did before TED, with a wider, more prominent appearance and baggy lower lids.
How Doctors Assess Severity
Doctors use a seven-point scoring system to evaluate how active the inflammation is. Each of these features counts as one point:
- Pain or pressure behind or around the eye
- Pain with eye movement (looking up, down, or sideways)
- Eyelid swelling
- Eyelid redness
- Redness of the white of the eye
- Swelling of the clear membrane over the white of the eye
- Inflammation of the inner corner tissue
A score of 3 or higher generally indicates active disease. This matters because treatment decisions, particularly whether anti-inflammatory therapies will help, depend heavily on whether the disease is still active or has already scarred into place.
Lasting Appearance Changes
Even after TED stabilizes, many people are left with visible changes: protruding eyes, retracted eyelids that show too much white, and a baggy or puffy look around the eye area. These changes can be significant enough to alter how someone looks in a way that’s immediately noticeable to others.
Once the disease has been stable for at least six months, surgical options can address the remaining changes. Orbital decompression removes bone or fat behind the eye to let it settle back into a more natural position. Strabismus surgery corrects misalignment that causes double vision by adjusting the tension on the eye muscles. Eyelid surgery repositions retracted lids so they sit at a normal height and close properly. These procedures are staged in a specific order because each one can affect the results of the next.