Superior nystagmus observation The Interacoustics Video Frenzel system: VF405 Basic and VF405 Extended. The VF405 provides ideal conditions for fixation-free observation of eye movements in patients being evaluated for vestibular disorders. Perfect eye images Crisp and contrasting rich eye images from the same high resolution FireWire cameras that we use in our VNG systems. The combi goggle The combination Goggle is light weight, with an easy fitting magnetic cover to allow for testing both with vision and with vision denied. The soft, disposable face cushions allow for a sanitary solution, are comfortable for the patient, and provide a completely light-tight fit to prevent the suppression of natural nystagmus responses.