Fig. 9. Electro-oculographic recording of vertical saccades in patient with thyroid ophthalmopathy. Both upward (U) and downward (D) saccades are rapid and equal. Upper tracing: eye position; lower tracing: peak velocity. (Metz HS: Saccadic velocity studies in endocrine eye disease. Am J Ophthalmol 84:695, 1977. Published with permission from the American Journal of Ophthalmology. Copyright by the Ophthalmic Publishing Company)