What transient nontraumatic cause can potentially lead to acute binocular loss of vision?

Acute binocular loss of vision can indeed be caused by transient nontraumatic factors, with both vertebrobasilar insufficiency and migraines being potential contributors.

Vertebrobasilar insufficiency pertains to reduced blood flow in the vertebral and basilar arteries, which can lead to neurologic symptoms including visual disturbances. This insufficiency might result from transient ischemic attacks (TIAs), which are temporary episodes of oxygen deficiency to the brain. When blood flow is diminished, individuals may experience sudden vision loss that affects both eyes due to the involvement of brain areas responsible for visual processing.

Migraines are another key cause of acute binocular loss of vision and can manifest as a transient visual aura or disturbances prior to, or during, a migraine episode. Visual symptoms can include shimmering lights, blind spots, or even temporary loss of vision in both eyes. This phenomenon occurs due to neurovascular changes and cortical spreading depression that affects the visual cortex.

Given that both vertebrobasilar insufficiency and migraine can lead to similar acute visual disturbances, the most comprehensive answer identifies both conditions as transient, nontraumatic causes for binocular loss of vision. This highlights the importance of considering different neurological factors when evaluating patients presenting with acute vision loss.