One of the diagnostic tests my neurologist insisted to do was the well known visual evoked potentials test, even though I have never had diplopia/blindness and my color vision was normal. I understand that he was checking for NMO/Devic syndrome. By the way AQP4 proteine blood test was negative.
I had to sit in front of a machine with blinking black and white small squares for about 10 to 15 minutes. The optical doctor (who possibly did not have any MS experience) has written in the test results document that I had a minor delay of 0.3 degrees, on both eyes. He could not correlate this with MS or get any kind of conclusion from that. The delay is of course meaning that the optical signal propagation is having trouble to arrive on time to the brain, but how much important are those 0.3 degrees? My neuro doctor was also not helpful to understand if this is a serious biomarker for NMO.
Does anybody have experience on evoked potentials outcome ? What is the expected outcome of the test? For example MRI lesions is well understood result and CSF oligoclonal bands present in the fluid but not in the serum (blood test) is a positive sign of MS (biomerker). But what about evoked potentials test results?
Thanks in advance for your assistance on that.