Image analysis of quick phase eye movement in nystagmus

A high speed video camera was used for analysis of quick phase eye movement in nystagmus. The frame rate of the camera was 250 Hz. Using a rotary slit-light projection system, optokinetic nystagmus (OKN) was easily evoked and the consequent eye movement was analysed by an image processing system. The high velocity component in nystagmus can be precisely detected with 250 Hz video rate while those with 30 Hz conventional rate showed a poor result in which the high velocity component declined significantly. The high speed video system was suitable for the analysis of the quick phase of nystagmus, especially in clinical diagnosis.