Perhaps a more specialised optical person.. fatigue directly affects vision as the eyes work via muscle.. so they will be more and less throughout the day depending on how tired the muscles are.. It won't be the fibro directly.. that's not possibly, however simply being more tired or stressed will affect eyesight.

I definitely get the blurry eyes a lot and it drives me crazy, especially when I need to read something immediately and I just can’t get them focused!!!

Yes and also night blindness. It comes and goes and the optician noticed a deteriation in the vision in just my left eye. Its not bad yet and i do have to wear glasses at times but its only really bad when im fatigued. I notice the blurring worse when i look from my phone to the TV it takes a little while to focus properly and if im fatigued it can take a few minutes to focus properly.

Yes mine do on and off x

I also get blurry eyes. It usually only lasts for like half an hour and the onset is random. It's almost like a thin film covers my eyes. I can't help trying to blink it away when it happens, even though blinking doesn't help.