Which arteries are generally responsible for simultaneous bilateral ocular symptoms in cerebrovascular disease?

The vertebrobasilar arteries are crucial in supplying blood to the posterior circulation of the brain, including regions that control eye movements and visual processing. When cerebrovascular events, such as ischemia or embolism, affect these arteries, they can lead to simultaneous bilateral ocular symptoms. This occurs because the blood supply to both eyes and their associated neural pathways can be compromised when there is an issue with the vertebrobasilar system.

Visual disturbances like diplopia (double vision), blurred vision, or loss of vision can arise from disruptions in this vascular territory. The bilateral nature of these symptoms is significant, as it typically indicates involvement of brain regions supplied by the vertebrobasilar system rather than isolated or unilateral conditions.

In contrast, the other arteries listed primarily supply different regions of the brain. The common carotid and internal carotid arteries predominantly supply the anterior circulation, while the external carotid arteries are mainly involved in supplying the face and neck. Therefore, they are less likely to cause bilateral ocular symptoms in the context of cerebrovascular disease.