Hi Su seb,
Vision issues is what I feel is my biggest hurdle also. I am trying to get into see a neuro ophthalmologist but in Canada they are very hard to see. I have seen my optometrist 3 times and, like you, am told that my vision is great and there are no issues. My neurologist says that it is the brain not able to keep up with what the eyes are seeing and that it will just take time. She did not say rest, just time.
If you have a chance though to see a neuro ophthalmologist I say go for it and they might be able to give you prism glasses or colour changing lenses to cut down on the eye strain. A lot of people here have had good luck seeing them or a NORA trained eye doctor
www.nora.cc check them out and see if there's someone near you.
I can tell you though that my eyes have gotten a little better in the last three months when I move my head and in moving vehicles etc so the brain is starting to catch up. Vestibular therapy might be helping that too. You'll probably notice improvements soon too. Think back a few months and maybe you will already have noticed some improvement.
I know how frustrating the eye issues are but just hang in there and you should start to see some improvement hopefully!
I hope you're having a good day.
CC