Am EMG is run to determine if the source of the numbness is in the peripheral nerves vs the central nerves. If the EMG is normal then the problem is in the CNS.
Dennis
I'm not an expert, but I seem to remember reading somewhere that emg's are better suited to finding peripheral nerve problems than central nervous system issues. This might include the foo/hand numbness.
The visual stuff I'm not sure about. I think it's good that you are seeing a specialist.
Kyle
By the way I had a positive Babinski response on the left foot and the doctor also noted slight left side weakness.