Flickering light can cause discomfort that varies across individuals with and without migraine based on factors such as color and contrast. This study observed how participants were able to discriminate between two flickering lights presented at different temporal frequencies and tracked whether small eye movements affected their perceptual judgement. Using electro-oculography (EOG), we monitored participant's eye stability during a freqeuncy discrimination task and verified central fixation throughout the trials. The EOG system was calibrated before each session to ensure an accurate measurement. Data from 2000 trials showed that most eye movements were minimal, clustering within 0-2 degrees, reflecting that participants maintained stable fixation during the task. Occasional outliers with larger shifts were rare. These results confirm that participants were able to sustain fixation while performing fine visual discrimination, validating the reliability of EOG as a tool for monitoring eye movements during psychophysical tasks involving flicker sensitivity.