von Graefe sign (lid lag sign): Failure of the upper lid to follow a downward movement of the eyeball when the patient changes his or her vision from looking up to looking down. Typically associated with hyperthyroidism and exophthalmos
Möbius sign: Diagnostic test in patients with Morbus Basedow (Graves disease) - the inability to maintain ocular convergence in the presence of hyperthyroidism.