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2 Journal of Medical Informatics & Technologies

2 2012

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The possibilities of optokinetic nystagmus cycles averaging

Pander T., Czabański R., Przybyła T., Pojda-Wilczek D.

Journal of Medical Informatics & Technologies

2012

Vol. 19

25--31

The analysis of eyes movements is a crucial part of eyes examination performed by clinicians. One of the characteristic type of eyes movements is a saccade. Its accurate detection is the base for further processing including the estimation of saccade parameters such as velocity, amplitude and duration. This paper presents averaging of optokinetic nystagmus (OKN) cycles that allows comparing and detecting different types of nystagmus phenomena. In order to average the OKN cycles the ENG signal needs to be processed. The saccade detection function is used to find the location of saccades in OKN waveform allowing the ENG signal to be divided into cycles. The resulting cycles are aligned using the Fourier shift method and then averaged providing the OKN cycle model, which can be used for evaluating the eyes at different movement conditions.

Saccades detection in optokinetic nystagmus - a fuzzy approach

Pander T., Czabański R., Przybyła T., Pojda-Wilczek D.

Journal of Medical Informatics & Technologies

2012

Vol. 19

33--39

The analysis of eye movements is valuable in both clinical work and research. One of the characteristic type of eye movements is saccade. The accurate detection of saccadic eye movements is the base for further processing of saccade parameters such velocity, amplitude and duration. This paper presents an accurate saccade detection method which is supported by the fuzzy clustering. The proposed detection function is computationally efficient and precisely determines the time position of the saccadic eye movement event. The described method is characterized by low sensitivity for any kind of noise and can be applied in the analysis of the congenital nystagmus.