  A wireless, wearable magnetic eye tracker is described and characterized. The
proposed instrumentation enables simultaneous evaluation of eye and head
angular displacements. Such a system can be used to determine the absolute gaze
direction as well as to analyze spontaneous eye re-orientation in response to
stimuli consisting in head rotations. The latter feature has implications to
analyze the vestibulo-ocular reflex and constitutes an interesting opportunity
to develop medical (oto-neurological) diagnostics. Details of data analysis are
reported together with some results obtained in-vivo or with simple mechanical
simulators that enable measurements under controlled conditions.
