My brain MRI from august showed a possible area of damage to my left optic nerve but I have had a VEP done now which is normal. I currently have problems with my vision if I have a hot bath and at other times where it goes cloudy or just not right. I also had an episode 10 years ago where I lost vision in both eyes for a few days. Is it possible to have a normal VEP and still have had optic neuritis or other vision involvement in MS. Also does anyone know if any other neurological conditions other than demyelinating ones lead to increased symptoms with hot baths and other heat? Finally if it were to be MS obviously I would expect lesions to show up on MRI at some point. Does anyone have any experience of them not showing up at first and how long it took for them to show up. How long after a first MRI would be reasonable to do another? Sorry for all the questions. Just so confused everyone including the MS specialist seems to be expecting to find that I have MS but dont seem to be getting any evidence.