Having balance issues. Neurologist did these: A) -a sonogram of my carotid, B) -a Doppler of both sides of my neck, and then ordered me to put on a set of goggles for, C) -a videonystagmography, the latest procedure that registers your eye-coordination and mobility (compromised or not), gauges your vestibular function (blowing air into each ear) etc. Takes forty minutes, during which the headband and goggles became, for me, uncomfortably claustrophobic. You may not experience this discomfort.