In normal vision the oculomotor system must achieve a delicate balance between too few fixational eye movements and too many, which lead to blurred and unstable vision during periods of fixation.

• 在正常的视觉里，眼球运动系统必须在过少或过多的凝视运动间维持精细的平衡，否则便会造成视力模糊及不稳。