Abstract
Eye movements were recorded in patients with vertigo as they were tracking a horizontally moving object. Effects of the colour of the object (white, yellow, green, blue, violet), the direction of motion (left - right or right - left), and of the caloric test on the left and on the right side (water temperature 30 °C) were investigated. We present a computerised method for objective, quantitative, and precise assessment of the data. The main indices recorded were: duration and relation between the phases, character of the peaks, disorganisation of the movements (if observed), and movement amplitude and area.
The results show that the experimental variables do affect the measured parameters. For example, durations were longer in yellow light (left - right direction) and for red colour (inversion movement), compared with movement in either direction for white, green, and blue. The caloric test shortened time periods and increased amplitudes in most of the conditions. A model of the process based on Fourier analysis is being developed. The aim is to use the proposed method for assessing disease-related changes and the effectiveness of therapy.
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