“TED – also known as Graves’ Orbitopathy or Ophthalmopathy – is an autoimmune condition. It occurs when the body’s immune system attacks the tissue surrounding the eye causing inflammation in the tissues around and behind the eye. In most patients, the same autoimmune condition that causes TED also affects the thyroid gland, resulting in Graves’ disease. Graves’ disease most commonly causes thyroid overactivity (hyperthyroidism).”

British Thyroid Foundation – BTF (https://www.btf-thyroid.org/thyroid-eye-disease-leaflet)