I can tell you from personal experience that VNGs are not always accurate. I have facial neuropathy in my trigeminal nerve chain that stretches from my throat to eye....and also in my ear. At the peak of my symptoms, I lost my hearing, experienced hyperacusis, and had loud ringing in my ear for over a year. My appointment with the ENT happened almost a year after my symptoms started. My VNG didn't show anything and I was told that my disequilibrium was of a central origin. This is a bunch of nonsense. I'm not even sure why I wasted hundreds of dollars on this appointment.