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Although the exact procedure may vary from product to product, the calibration process generally involves using the instrument to test samples of one or more known values called âcalibrators.â The results are used to establish a relationship between the measurement technique used by the instrument and the known values.
Calibration is the process of calculating a conversion factor so that the parameters measured by the recording device can be converted into eye movements. Therefore, a faulty calibration will cause the amplitude of the eye movements to be inaccurate in all of the subsequent subtests in the ENG or VNG test battery. Let us examine the calibration procedure in more detail and identify the causes that can lead to calibration errors.