Video-Oculography

Measurement of eye movements is important for diagnosis of disorders of the visual system. While different systems can be used for the recording of eye movements, video-oculography (VOG) has - due to the increasing capability of computers and video systems - become progressively more important.
To improve the quality of video-oculography, new approaches were investigated  to reduce remaining limitations. These limitations arise because only parts of the information available in the images of the eye is used to determine the orientation of the eye.

  • Since for the horizontal/vertical eye position only the center of the pupil is typically used, inaccurate detections of the pupil center cannot be recognized and lead to inaccurate measurements of the orientation of the eye.
  • For recording the torsional orientation of the eye, most video-oculography systems use only small, hand-selected iral patterns. The choice of these patterns affects the measurement for the torsional eye position, and makes it dependent on the individual experience of the user.

VOG System from SMI

The VOG project within SEE-KID aims at the implementation of a clinically applicable binocular strabismus test in connection with the automatic storage of measurements in the SEE++ Software System. Currently, we use a 3D VOG system from SMI (SensoMotoric Instruments, Inc., Teltow/Berlin, Germany). However, these type of systems cannot distinguish between eye movements and camera slippages and have accuracy problems which in turn limit their clinical applicability.

Currently, SEE++ supports a VOG mode that connects a VOG system via network and records measurements results on the fly. A VOG-based test of binocular function is currently being realized.