Normally, both eyes are aimed at the same target. When the target is near, the eyes must converge in order to fixate upon the target.
Convergence movements are non-conjugate.
Saccadic vs. pursuit eye movements. These two different types of conjugate eye movements have different neural substrates. For more information, click on saccadic eye movements or pursuit eye movements . The cortical mechanisms for initiation of saccadic and pursuit eye movements are discussed elsewhere . The frontal eye fields can initiate horizontal saccades directed away from the active hemisphere.