Benign paroxysmal positional vertigo

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BBPV, or benign paroxysmal positional vertigo, is the most common cause of vertigo. BPPV can be diagnosed — and treated — by moving the patient’s head in certain ways that reposition the ear crystals. Wendy Webb Schoenewald, physical therapist and specialist in vertigo, has high-tech goggles that help her diagnose BPPV by watching the patient’s eye movements. (CLEM MURRAY / Staff Photographer)