Chapter: Medical Electronics : Electro-Physiology and Bio-Potential Recording
EOG (Electroculogram)
EOG (ELECTROCULOGRAM)
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.
EOG MEASUREMENT
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
Related Topics