With the advent of digital computer measurement techniques for nystagmus parameter determinations, the need has arisen for careful quality control of nystagmus recording methods. For this study, electronic filter distortion of nystagmus waveforms was quantified, and the results were used to formulate guidelines for selection of appropiate band-widths depending on the user's requirements. For minimum distortion, a lower time constant of at least three seconds and an upper frequency cutoff of at least 60 hertz are recommended.