Thyroid-associated orbitopathy, also known as Graves' orbitopathy or thyroid eye disease, is an autoimmune condition characterized by inflammation and swelling of the eye muscles, eyelids, and surrounding tissues. It is commonly associated with Graves' disease, an autoimmune disorder that causes hyperthyroidism. This condition can lead to various ocular symptoms and complications, including proptosis (bulging eyes), diplopia (double vision), and in severe cases, vision loss.