jrojas21:
Hello, I am not sure what is meant by two ADCs. So from my understanding it is a continuous signal so if the person is looking straight ahead then on the oscilloscope you don't see any spike because there is no horizontal eye movement detected.
Brush up on your physiology a bit. There is ALWAYS eye movement. Otherwise the image your brain makes will fade. But the peak your looking for will be far above the noise signal.
Paul