Idiopathic bilateral vestibulopathy

Idiopathic bilateral vestibulopathy (IBV), also known as idiopathic bilateral vestibular hypofunction or bilateral vestibular failure of unknown cause, is a rare disorder affecting the vestibular (balance) system in both inner ears. The vestibular organs are responsible for detecting head movement and maintaining balance, spatial orientation, and stable vision during motion. In IBV, both vestibular organs progressively lose function without an identifiable underlying cause such as ototoxic medication exposure, infection, autoimmune disease, or structural abnormality — hence the term 'idiopathic.' The hallmark symptoms of IBV include chronic imbalance and unsteadiness, particularly when walking, which worsens significantly in darkness or on uneven surfaces. Patients typically experience oscillopsia — the illusion that the visual world is bouncing or blurring during head movements or while walking — due to the loss of the vestibulo-ocular reflex that normally stabilizes gaze. Unlike many vestibular disorders, true rotational vertigo episodes are not always prominent, though some patients may experience episodic vertigo early in the disease course. Hearing loss may or may not be present. The condition profoundly impacts quality of life, increasing fall risk and limiting daily activities. There is currently no curative treatment for idiopathic bilateral vestibulopathy. Management focuses on vestibular rehabilitation therapy, which involves structured exercises designed to promote central nervous system compensation for the vestibular deficit, improve balance, and reduce oscillopsia. Patients are counseled on fall prevention strategies and environmental modifications. Some patients may benefit from assistive devices. Research into vestibular implants is ongoing but remains experimental. The course of the disease is variable; some patients stabilize while others experience progressive decline in vestibular function over time.

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