The Ideas III is an Electronystagmography (ENG) system. Electronystagmography measures eye movements using the method of electro-oculography (EOG). In this method, skinmounted electrodes measure changes in potentials across the eyeball due to movement of the eye in its socket. The corneal retinal potential is the source of the measured voltage. Those movements are recorded and transmitted to a computer. The eye movement is analyzed by the software.Ideas III is the essential tool to study the various functions of balance, namely the oculomotricity (ocular saccades, pursuit, optokinetic nystagmus) and the study of the vestibular system (spontaneous and positional nystagmi, rotary tests, caloric tests). Ideas III is able to record horizontal and vertical movements simultaneously on both eyes or on one eye only.
A graphic recorder used for detecting the electrical potential caused by eye movements. This recorder includes an electrode for each eye and one on the forehead (multichannel recording) for measuring the potential from both eyes simultaneously, or repositioning of the electrodes before each test for single channel recording. Electronystagmographs are used for detecting multiple sclerosis, vestibular dysfunctions, the presence of drugs and other specific disorders characterized by involuntary eye movement (nystagmus).