1.What is visual electrophysiological examination? What does it include? As the eye is stimulated by light or graphics, tiny electrical activities such as potentials and currents are generated, which is visual electrophysiology. The visual electrophysiological examination includes three major parts: electrooculogram (EOG), electroretinogram (ERG) and visual evoked potential (VEP). The electrooculogram (EOG) mainly reflects the function of the retinal pigment epithelium-photoreceptor complex. The electroretinogram (ERG) mainly reflects the function of retinal photoreceptor cells to bipolar cells and long-free synaptic cells. The visual evoked potential (VEP) mainly reflects the conduction function from retinal ganglion cells to the visual center. 2.What is the significance of visual electrophysiological examination? Visual electrophysiological examination is a non-invasive objective examination method of visual function, which is not only suitable for general patients, but also for patients who cannot do psychophysical examination, such as infants and children, people with mental retardation or pseudo-blindness; in addition, for those who have refractive interstitial clouding and cannot see the fundus, it can overcome the obstacle of clouding and determine the visual function, such as cataract and vitreous clouding. Preoperative visual electrophysiological examination of retinal detachment can help predict the recovery of vision after surgery. In addition, when visual electrophysiological examination methods are combined, the entire visual system disorders can be diagnosed in a stratified localized manner, and the visual system can be tomographically scanned functionally. Thus, visual electrophysiological examination has become more and more widely used in ophthalmology clinics.