Igor Vicha, Eva Vlkova, Radek Girgle (Department of Ophthalmology, Masaryk University and University Hospital, Brno, Czech Republic), Jiri Rozman, Martin Cizek, Jiri Dlouhy (Department of Biomedical Engineering, Faculty of Electrical Engineering and Communication, University of Technology, Brno, Czech Republic)


A new electronic system helps patients to keep their heads in optimum position after vitrectomy (firstly with gas). A head-mounted device continually monitors the head position and immediately warns the patient whenever the position of the head is not within the ideal range set by the clinician. Position data is stored in regular intervals into the flash memory; each non-ideal head position occurrence is also saved.


Head position is described by the means of angle of tilt in all axes. As a sensing element a 3D accelerometer is utilized. Computer software for data acquisition and analysis is also a part of the system. During postoperative examinations position data can be downloaded to the host computer at the clinic, further analysed and confronted with the actual therapy results.

Effectiveness / Safety:

Proposed solution will improve results of vitreoretinal surgery procedures. The designed system is in fact an application of Holter monitoring, biofeedback and biotelemetry. Minimizing overall size and mass of the device together with clinical testing will be one of the next efforts in development. Supported by Czech Science Foundation: project No. 102/08/1373.