Abadie's sign is a medical sign of hyperthyroidism that is described by exophthalmos of both eyeballs, it is primarily caused by levator palpebrae superioris muscle spasm and appears as a clinically bulging eyes appearance 1.
History and etymology
Jean Marie Charles Abadie (1842–1932) was a French ophthalmologist who described this eponymous sign. His works on multiple eye conditions includes trachoma and glaucoma.