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EE 4BD4 Lecture 12

EE 4BD4 Lecture 12. Electro- ocularogram EOG. Other Theories. Dipole is generated by a distribution of positive and negative charges in the retina only Signal results from eyelid moving over the eyeball (similar to blink artifact in EEG) Not a result of EMG of extra-ocular muscles.

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EE 4BD4 Lecture 12

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  1. EE 4BD4 Lecture 12 Electro-ocularogram EOG

  2. Other Theories • Dipole is generated by a distribution of positive and negative charges in the retina only • Signal results from eyelid moving over the eyeball (similar to blink artifact in EEG) • Not a result of EMG of extra-ocular muscles

  3. Extra-Ocular Muscles

  4. Utility of EOG • Help in diagnosis of eye pathologies • Important data • Saccadic movement parameters • Arden Ratio • Identification of REM sleep • Computer interface for the disabled

  5. Design Considerations • Electrodes (Ag-AgCl - drift free) • Bandwidth (filtering) • What about instrumentation or Op amp voltage offsets? • AD 620 max voltage offset RTI = 125 µV • Additional analog circuitry?

  6. Offset Adjust Circuit

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