Fig. 8. Electro-oculographic recording of horizontal saccades in left eye of a patient with Duane syndrome, type I. Abduction saccades (L) are very slow (70 degrees per second) whereas adduction saccades (R) are reduced moderately in velocity in the upper tracing. Lower tracing: peak velocity. (Metz HS, Scott AB, Scott WE: Horizontal velocities in Duane's syndrome. Am J Ophthalmol 80:901, 1975. Published with permission from the American Journal of Ophthalmology. Copyright by The Ophthalmic Publishing Company)