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  • Visual evoked potential electrodes designed to be placed on the cornea (i.e., at the front of the eye) to measure the transient change in the electrical potential of the retina in response to a sudden flash of light (i.e., electroretinography, ERG). Corneal electrodes typically include speculum structures used for holding the eye open and a contact lens with a wire ring (i.e., an electrode) supported by a small spring that floats on the cornea. They are gently placed on each eye with a device very similar to a contact lens inserter; an additional electrode is placed on the skin to provide a ground for the very faint electrical signals produced by the retina. The information from the corneal electrodes measuring the electrical activity of the retina in response to the flash of light is transmitted to a monitor where it is displayed. Reference skin electrodes are to be placed just above and below the eye. ERG electrodes are commonly used in procedures for evaluating both inherited (hereditary) and acquired disorders of the retina; they are also used in analysis combining electrooculography and electroretinography studies to help diagnose certain retinal diseases.
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