What Is Graves’ Disease?
Graves disease is an autoimmune disorder that leads to overactivity of the thyroid gland (hyperthyroidism).The gland produces hormones that regulate your body’s metabolism (the process by which the body transforms food into energy).
When Graves’ disease affects the eyes, the condition is known as thyroid associated ophthalmopathy (TAO) or thyroid eye disease. Graves’ disease usually appears before age 40.
Too much thyroid hormone along with circulating antibodies may cause the soft tissues and muscles that surround the eye to swell. Structures within the eye’s orbit — the bony space in which the eyeball sits — include muscles, blood vessels and nerves. When these structures swell within the enclosed space of the orbit, the eyes protrude or bulge. This may lead to problems moving the eyes, often resulting in double vision, one of the more common signs of thyroid ophthalmopathy.