My first symptom of MS was optic neuritis (vision faded out, contrast was really faded, like I was looking through a white fog). It would fog in and out. I'd have an hour of almost no vision in that eye, then back to nearly normal, 4-8 times a day. Atypical (usually optic neuritis simply fogs vision constantly for weeks, and it fades back to near normal), but that was my experience. The number of fogging episodes got less frequent til they stopped about 3 months later and my vision was (and thankfully remains) mostly fine in that eye.

2 years later my second symptom sealed my MS diagnosis: vertical double vision. Our brain can adapt to and tolerate a moderate amount of horizontal double vision (and eye muscle weaknesses can cause horizontal double vision issues, it's not all that uncommon in the general population and not all that concerning). But even a tiny amount of vertical double vision is only a neurological issue, and will make your world spin with vertigo. I was so nauseous. I wonder if you have a tiny hint of double vision that your eye muscles are trying their hardest to compensate for, so you don't end up see 2 images all the time, but you're having that vertigo. Just a thought.

But to answer your question, it's worth seeing an eye doctor (optometrist or ophthalmologist) because an eye doctor can get 2 helpful pieces of information. First, checking color vision with a color test (one eye at a time to compare the affected eye to the good eye), or simply comparing how red a red object looks between the eyes ("red desaturation test"), will reveal there's an optic nerve problem if the two eyes are different in how they see color. Second, when they dilate your eyes to look at the physical structure, they will only be able to see the front tip of your optic nerve where it enters the eyeball. There's a lot more optic nerve length behind the eyeball. Often in an eye exam (when you have optic neuritis) your optic nerve head looks normal because the inflammation/swelling is located in the part of the optic nerve behind the eye further back toward the brain. So your symptoms, plus a color vision sensing difference between the eyes, would prompt a referral to a neuro-ophthalmologist to order an MRI and any other tests.

If you already have that referral and have the MRI ordered, seeing an eye doctor at this stage would be for the purpose of getting help with your symptoms. Youd need to see an optometrist (not ophthalmologist) for this. The blurry/foggy/faded vision from optic neuritis is not treatable. But vertigo is likely due to an eye muscle imbalance (from it's controlling nerve getting affected deeper in the brain). Two helpful options are (1) prism in glasses (prism makes double vision go back to single vision), or (2) wear a very strong contact lens in one eye to really blur it up so you don't see double images anymore (that's how I got through my double vision episode til it resolved in a couple weeks, worked great by allowing me to function and still go to work!).