Thyroid-associated ophthalmopathy (TAO) is an autoimmune disease that is often accompanied by abnormal thyroid function and protrusion of the eye. Many ophthalmologists and patients have misconceptions about this disease: 1) that if you have thyroid-related eye disease, you must have hyperthyroidism. 2. They think that if hyperthyroidism is cured, thyroid-related eye disease will recover naturally. These perceptions are wrong. It is because of these misconceptions that many patients miss the best time for treatment and are left with serious sequelae. First, thyroid-related eye disease can be hyperthyroid or normal, or even hypothyroid; second, if a patient with thyroid-related eye disease is accompanied by hyperthyroidism, both diseases should be treated at the same time, not just hyperthyroidism, which can be treated with drugs that are ineffective for thyroid-related eye disease, or even aggravated by treatment like I131. This shows that once thyroid-related eye disease is detected, it needs to be treated early to avoid further aggravation and serious complications.