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The aim of this study was to examine the characteristics of monocular eye movements recorded using video-oculography (VOG). VOG monocular recording has become increasingly popular in comparison to electro-oculographic binocular recording, due to its simple technique. The authors evaluated the horizontal saccades and smooth pursuit eye movements of the right eye in 66 healthy subjects. Measurements were obtained using a video-oculography eye movement recording system, within a range of 30 degrees. Saccade latency, velocity, accuracy and smooth pursuit gain were measured and analysed by age and direction. Results showed that saccade parameters (latency, velocity and amplitude) and smooth pursuit gain deteriorated with age in this healthy cohort. In addition, saccade velocity and accuracy were significantly larger during adduction than during abduction. The smooth pursuit gain did not differ between adduction and abduction. The authors discuss that, in video-oculographic monocular recording of saccades, it is necessary to recognise the possibility of adduction-abduction asymmetry.

Adduction-abduction asymmetry in saccades during video-oculographic monocular recording: a word of caution.
Takahashi K, Tanaka O, Kudo Y, et al.
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Claire Howard

Salford Royal NHS Foundation Trust, Salford, UK.

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