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Balance disorders like vertigo can be devastating for patients—but they’re often invisible to the doctors who treat them. One morning last August, while making my bed, my entire visual field shifted sharply to the left, as though I were watching a movie and someone had bumped into the projector. After half a second, my vision snapped back into position. I froze, pillow in hand, and carefully looked around. The furniture in my room was still, apparently innocent of whatever had just happened.