Reduzierung von Bewegungsartefakten in Video- Okulographie Systemen

Motivation: To ensure sharp vision during movement, the visual system is closely coupled to our balance system. As a result, eye movements can provide valuable input for the diagnosis of vestibular pathologies. Recently Video-Oculography systems (VOG), video based systems for measuring eye movements, have become much cheaper as a result of progress in video technologies, and are now widely available as a supporting tool for clinical diagnosis. However, they still suffer from a few basic weaknesses. One is the difficulty to distinguish between eye movements and movements of the camera with respect to the head. In our project we want to tackle this problem, and reduce artifacts from such camera movements. Results: Measurements of the camera movement indicate that the displacements of VOG systems relative to the head can reach a distance of up to 2mm, causing significant errors in VOG based eye position recordings. By simulating the effect of motion artifacts in VOG systems we show that especially in eccentric eye positions these artifacts have to be compensated to obtain exact measurement of eye movement during rapid head impulses.