No one can rule out MS if the optic discs are normal. Period! Also, 64% of people who have optic neuritis have normal appearing optic discs. So, while pale discs and evidence of optic neuritis can be used to help validate a diagnosis of MS, a normal eye exam can NOT be used to rule it out.
Whoever said that normal appearing optic discs rules out MS is a dodo!
Q
It definitely is possible - I have confirmed MS and have not had a known case of ON.
I hope that helps.
L
Not everybody with MS has optic neuritis...