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两眼同时视物时的视觉。双眼位于头部两侧的哺乳动物，如兔等，其两眼的视野完全不同，因此，此类动物只有单眼视觉。人和灵长类动物，如猩猩和猴等，两眼都位于头的前方，视物时双眼可感受同一物体的光刺激，两眼的绝大部分视野重叠，因此具有双眼视觉的功能。双眼视觉不但补偿了单眼视觉存在盲点的缺陷，又扩大了平面视野，而且增加了深度觉，产生了立体视觉，并且还增强了对物体大小和距离判断等的准确性。双眼视觉的完成还要依靠两眼眼外肌的精细协调动作。从看远方物体转而凝视近物时，两眼的内直肌收缩，同时外直肌松弛，两眼向中会聚（视轴会合），使物体成像在两眼的中央凹部分。两眼的视觉冲动沿视神经而传到皮层视觉中枢，从而产生单一物体的感觉。（见视野）。
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