The Ocular Surface Case Series is a quarterly video segment featuring experts in the area of ocular surface disease who discuss recent studies and their clinical experience. Christopher E. Starr, MD, FACS, of Weill Cornell Medical College in New York moderates this series and shares his pearls for treating the ocular surface.


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Visual Evoked Potential

by Glen Steele, OD

Derek Cunningham, OD, and Walt Whitley, OD, MBA, discuss the application of visual evoked potential (VEP) for measuring the functional integrity of a patient's visual system. During the VEP test, responses to a visual stimulus, such as an alternating checkerboard pattern on a computer screen, are recorded from electrodes placed on the back of the patient's head. An electroencephalogram (EEG) reading indicates the time that it takes for a visual stimulus to travel from the eye to the occipital cortex; abnormal findings may indicate functional deficiencies in the visual pathway. Among its many potential applications, VEP can be useful for managing brain trauma victims, pediatric patients, and non-verbal patients. It may also offer utility as a device for detection of early glaucomatous disease. Dr. Cunningham speaks with Glen Steele, OD, about how he uses VEP in his pediatric patient population and how ongoing research with VEP might grow the utility of VEP testing.