EOG is the recording of the biopotentials generated by the movement of eyes. Here, corneal-retinal potentials associated with eye movement is recorded. Electrode used in EOG: surface electrodes are used to measure EOG.
ü Block diagram of EOG measurement system is shown. In the figure, position of electrodes is shown.
ü One pair of electrodes is placed above and below the nose. These electrodes are used to measure thhe vertical movement of eye. The signals from these two pairs of electrodes are give n to the amplifier.
ü Another pair of e lectrodes is placed in the left side and ri ght side of the eye. Horizontal movem ent of an eye is measured by using these elecctrodes.
ü The signals from these electrodes are given to the amplifier circuit.
Applications of EOG
ü The effect of some drugs on the eye movement systems can be identified by using EOG.
ü It is used to analyze the state of semicircular canals.
ü Diagnosis of the neurologic disorders is possible.
ü The level of anesthesia can be indicated by the characteristic of eye movement