Depends on the symptoms. ODs can definitely diagnose optic neuritis and the accompanying signs of MS.
You look for indistinct margins on the optic nerve, but depending on the location of the inflammation it may or may not show there. (it could be retrobulbar -- or on the nerve behind the eye)
Decrease in VA.
Pain on eye movement
Increase in symptoms with heat or exercise.
Change in color vision (or desaturation) between the two eyes. Check with plates or "red cap" test.
These are just the ones I remember off the top of my head.
The important thing to remember is that a diagnosis of neuritis does NOT mean the patient has MS. They have to go to a neurologist for an MRI of the brain to rule out plaques. If I remember correctly less than 50% of patients presenting with optic neuritis convert MS. But, you have to make sure the patient is aware it is a possibility.
So, to answer your question the short way... YES, ODs get some training in MS. 😉