Okulographische methoden

Oculographic Methods: Recent developments in hardware and software have considerably improved our prospects of measuring eye movements in clinical and scientific applications. Each of the different methods has its specific pros and cons, as outlined in this chapter. Despite its liability to artifacts and its low resolution, classical electrooculography (EOG) is still the gold standard for clinical routine, as it is easy to handle, cheap, and non-invasive, displays lid artifacts and measures horizontal eye movements with sufficient accuracy. In contrast, the magnetic search coil system is invasive and requires great technical effort, but is the most precise system, even in 3 dimensions. Modern video-based systems are gradually approaching this standard, now permitting sampling rates that are sufficient for the analysis of saccades. Their stability and signal-to-noise ratio is much better than of the 2-dimensional infrared reflection devices (limbus trackers) which, however, are more flexible and are also suitable for mobile use.