is a disorder marked by the loss of eye and pupil movements, while autonomic responses remain intact. The condition is associated with hyperthyroid disorders, such as exophthalmic goiter (see exophthalmos). Also known as Ballet’s sign- ophthalmoplegia externa. [Gilbert Ballet (1853-1916), French neurologist]

BALLET’S DISEASE: “A person with Ballet’s disease is unable to move his or pupil, possible due to a thyroid condition.”