Electrooculography Signals Research Articles

Automatic testing of the visual field using electro-oculographic potentials

The central visual field is tested using static perimetry on a tangent screen located 1 m from the patient. During the test electro-oculographic (EOG) potentials, associated with eye movements, are recorded. For this purpose two pairs of electrodes are placed in such a way that one pair records the vertical and the other the horizontal component of the EOG potential. The EOG signals that are produced when the tested eye moves toward the light target on the screen are digitized and fed into a computer programmed to relate each pair of signals to the specific lamp on the tangent screen. The results of the test appear on a computer-printed chart that shows the distribution of the lamps on the testing board together with the information whether the lamp was seen by the subject. This method of visual field testing is both objective and automatic.

An Automatic Measuring and Recording System for Clinical Electro-Oculography

A new electronic automatic measuring and recording system for electro-oculography is described. The heart of the system is represented by a digital programmer and electronic integrator. The electro-oculographic signal is integrated for both positive and negative half cycles for 20 sec during each minute of the test. Because of the increased sample time and integration of each full cycle of the EOG signal, an enhanced accuracy in measuring the corneo-fundal potential has been achieved. The immediately available display of the EOG during light and dark adaptation makes clinical electro-oculography more convenient for frequent use in an electrodiagnostic laboratory.