fascinates me. I had an individual with lateral canal cupulolithiasis the other day. He was constantly feeling things moving. I thought for sure he had a hypofunction, but when I put the lenses on him and had him flex his head the nystagmus reversed directions. He had ageotropic nystagmus in the roll test positions. I did a series of lateral canal cupulolithiasis and canalithiasis maneuvers, forced positioning with vibration and gave him forced positioning for home. He returned with no nystagmus at all and was no longer dizzy.