We describe the quantitative analysis of refixation saccades in a man who had a left hemispherectomy 11 years previously. Saccades in both directions were of equal maximum angular velocities. However, refixation saccades to the right were grossly inaccurate compared to those to the left. Eye movement experiments with proprioceptive extremity input and those performed in total darkness indicated that the unidirectional inaccuracy was not entirely due to the complete right homonymous field defect. The subject demonstrated two unique types of corrective eye movements for dysmetric saccades and a high proportion of hypometric saccades in a rightward direction. These quantitative studies defined the functional capability of the single cerebral hemisphere in making saccades in each direction.