How Does Monovision Affect VEP Tests?

Hello, I have focal muscle weakness in right lower extremity, ongoing since an acute episode of swelling and severe pain with no injury in the ankle and right great toe. I have had 2 nerve conduction/EMG tests from 2 different neurologists as my insurance changed in January. The first test with the Blue Cross Dr. showed neuropathy and the second test with Kaiser came back normal. The new insurance company does not seem to want to consider the first test even though I still have very limited plantar flexion and also milder dorsiflexion limitation that is affecting my gait. A brain MRI revealed a 5mm white matter lesion on FLAIR in the left frontal lobe but no other abnormalities found on brain MRI except a 9mm pineal gland cyst. I had a VEP test 3 times because the first 2 were borderline results. The third test is said to be normal, but I have monovision and would like to know how that could affect the VEP test. I did have several monoclonic jerks during the reversing checkerboard stimulus part of the test. I am awaiting results for SSEP and BAEP tests. Questions: 1. Is it possible to have a false negative on NCS/EMG? 2. How does monovision affect VEP tests?