When tracking a moving object and it moves beyond the field of view, the eyes saccade back to the original position. Which reflex is primarily responsible?

When tracking a moving object and it moves beyond the field of view, the eyes saccade back to the original position. Which reflex is primarily responsible?

• A. Optokinetic reflex
• B. Vestibulo-ocular reflex
• C. Vestibulospinal reflex
• D. Oculomotor reflex

Answer: (A)

The effect described is driven by the optokinetic reflex. When there is wide-field visual motion, the eyes first follow the moving scene with a slow, smooth tracking movement. Once the image crosses the edge of the field of view, a quick corrective eye movement—the reset saccade—pulls the gaze back toward the original position so the scene can be tracked again. This combination of slow pursuit and fast reset is the hallmark of the optokinetic response and explains why the eyes return to the starting point after the object moves out of view. The vestibulo-ocular reflex would stabilize gaze during head movements, not this scene-driven reset; vestibulospinal and oculomotor terms don’t capture this specific reflex mechanism.

The effect described is driven by the optokinetic reflex. When there is wide-field visual motion, the eyes first follow the moving scene with a slow, smooth tracking movement. Once the image crosses the edge of the field of view, a quick corrective eye movement—the reset saccade—pulls the gaze back toward the original position so the scene can be tracked again. This combination of slow pursuit and fast reset is the hallmark of the optokinetic response and explains why the eyes return to the starting point after the object moves out of view. The vestibulo-ocular reflex would stabilize gaze during head movements, not this scene-driven reset; vestibulospinal and oculomotor terms don’t capture this specific reflex mechanism.