The Heimann-Bielschowsky phenomenon (HBP) is an underrecognized condition characterized by\nslow, pendular, vertical oscillations of the eye accompanying monocular vision loss. Hypotropic dissociated vertical\ndeviation (DVD) is another rare condition induced by asymmetric visual input. This report documents a rare case of\nHBP with hypotropic DVD.\nCase presentation: This report describes a case of a 58-year-old woman with HBP and hypotropic DVD, having\nsuffered monocular vision loss in the left eye due to blunt trauma at the age of 10. Preoperatively, she was\northophoric at near fixation and demonstrated an intermittent, slow hypotropia of the left eye upon distance\nfixation that never rose above the midline. She underwent a 7mm recession of the inferior rectus muscle in the left\neye. After surgery, intermittent, downward drifts became constant vertical oscillations at both distance and near\nfixation.\nConclusions: This case describes the clinical manifestation of an eye movement disorder related to prolonged\nmonocular vision loss.
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