In general, unidentified microscopic white matter lesions (subcortical T2 hyperintesities) in the frontal lobes are very very common so not typically MS related, hyperintensities are less likely to be MS related when they are micro foci (<3mm) sized cause they're more commonly associated with vascular issues eg migraine, hypertension etc
Hope that helps.....JJ
The brain MRI evidence you've mentioned still wouldn't get someone diagnosed with MS even if they had an abnormal VEP and or OCT because an abnormal visual evoked potential could be caused by some other medical condition eg type 2 diabetes, glaucoma, Optic neuropathy, Optic Neuritis etc
Optic Neuritis (ON) is most commonly associated with a neurological condition like MS but even Optic Neuritis (ON) can be a stand alone visial condition......
Without anything else it's more likely for those type of Brain MRI results to be interpreted as being perfectly normal. It would generably be the abnormal VEP that would put a neurological condition like MS on your possible causation list.
Hope that helps....JJ