The value of the visual field examination in the identification and localization of brain lesions is well known. In the constant search for new and improved methods of measurement of deficits associated with brain pathology, the flicker-fusion perimetry method, i.e., determination of thresholds for flicker and fusion throughout the visual field, has been investigated.1-4 At least one investigator, Miles,3 concludes that the flicker perimetry technique has many advantages over standard campimetric techniques, including that of greater sensitivity. Using the Miles technique, Havener and Henderson4 compared standard and flicker perimetry techniques in 20 cases with neurological defects. They suggested that flicker perimetry is superior to standard perimetry in detecting early lesions of the visual pathways, provided the lesions are extensive enough to include the whole area of the flicker bulb in the scotoma. While the quantitative possibilities of the flicker perimetry method (i.e., obtaining thresholds which may be