This is probably the first symptom that takes you to see your doctor, it was for Ella who was diagnosed with visual migraine at the age of 15. It was not until she was 21 that she obtained the MS diagnosis. Recently we have found that it is not just MS that has optic neuritis as a presenting factor. Intracranial Hypertension (IH) also presents with a similar symptom, not supprising really as Intracranial Hypertension is caused by some constriction of the transverse sinus within the brain, here is a link to a site where images of the retina/optic nerve can be seen to show the typical pale disc which is a tell tale sign of what neurologists like to call Multiple Sclerosis... We are not a million miles away from CCSVI in IH.
http://webeye.ophth.uiowa.edu/education ... s/item/172