Thyroid-associated ophthalmopathy is a very common eye disease, usually due to hyperthyroidism, resulting in inflammatory infiltration of the muscles or tissues around the eyes. Clinical manifestations usually include the following: First, the appearance of bilateral upper lid recession. Second, protrusion of the eyeballs occurs, and the longer the course of the disease, the more pronounced the protrusion of the eyeballs. Third, with the loss of extraocular muscle function, there is the possibility of ocular motility disorders. Fourth, if the inflammation involves the cornea, it may lead to lesions of the cornea, such as the appearance of exposure keratitis, corneal ulcers, and even corneal perforation in severe cases. Fifth, optic neuropathy, which is caused by intraorbital edema and elevated orbital pressure. These are some common symptoms of thyroid-related eye disease.