Thyroid eye disease (TED) is an autoimmune condition that affects the eyes and is commonly associated with Graves' disease, a disorder that causes hyperthyroidism. In TED, the immune system mistakenly attacks the tissues around the eyes, leading to inflammation and swelling. This can result in symptoms such as bulging eyes, dryness, and discomfort. The condition can also affect vision, causing double vision or difficulty moving the eyes. Treatment options for thyroid eye disease may include medications, radiation therapy, or surgery, depending on the severity of the symptoms and the underlying thyroid condition.