Disorders · Introduction
Bilateral vestibulopathy
When both labyrinths fail, the room stops spinning but the ground stops feeling solid — unsteadiness that worsens in the dark and vision that blurs whenever the head moves. A quiet, disabling disorder, defined by numbers and managed by rehabilitation.
What it is
Bilateral vestibulopathy is a long-term loss of the balance organ’s function on both sides of the head. People feel unsteady on their feet — especially in the dark or on uneven ground — and their sight blurs or bounces whenever they move their head, for example while walking. Unlike most vertigo, there is usually no spinning.
Bilateral vestibulopathy is a chronic syndrome of reduced or absent function in both vestibular labyrinths. The two cardinal symptoms are gait imbalance that worsens in darkness and oscillopsia — visual blurring on head movement from a failed vestibulo-ocular reflex. Because both sides fail together, there is typically little or no spinning vertigo.1
Two themes run through this chapter. First, the diagnosis is quantitative: the Bárány Society 2017 criteria require the symptom cluster plus documented bilateral hypofunction across the frequency range — caloric, vHIT and/or rotational chair.1 Second, management is functional, not pharmacological — find and stop the cause, then rehabilitate; no drug restores lost vestibular function.
By the numbers
Bilateral vestibulopathy is uncommon but under-recognised, and it carries a real burden — a strong association with falls and a quality-of-life cost comparable to major chronic disease.2 About a quarter of cases remain idiopathic after a full work-up.3
Precipitating events
Illustrative distribution of causes — about a quarter remain idiopathic after a full work-up; ototoxicity is the most important preventable cause.
How this chapter is organised
- Causes & mechanism — why both sides fail, and the causes from gentamicin to CANVAS.
- Clinical features — imbalance in the dark, oscillopsia, and the bedside examination.
- Diagnosis & criteria — the Bárány thresholds, the test battery, and an interactive criteria checker.
- Differential diagnosis — unilateral loss, cerebellar disease, sensory ataxia and PPPD.
- Management & rehab — stop the cause, vestibular rehabilitation, and the vestibular implant.
Key points
- Chronic, usually symmetric loss of vestibular function on both sides.
- Cardinal symptoms: imbalance worse in the dark, plus oscillopsia on head movement — with little spinning vertigo.
- Diagnosis is quantitative (Bárány 2017): symptoms + bilaterally reduced caloric/vHIT/rotational-chair function + no better explanation.
- Search for a cause — aminoglycoside ototoxicity is the most important preventable one; ~25% stay idiopathic; consider CANVAS.
- Management is functional — stop the cause, vestibular rehabilitation, avoid suppressants; the vestibular implant is emerging.