Fig. (2) * Left LTypical eye-movement responses of patients 9 (A) and 6 (B) who had prolonged un-corrected strabismus. Both patients responded with saccadic eye-movements with little or no vergence. Middle (M): Vergence response, (right eye - left eye). Right (R): Conjugate response, (right eye + left eye)/2.* In the figure movement of the eye to the right is displayed downward, and movement to the left is displayed upward in the graph.