This thread split two ways earlier, and as unsoclicited as it may be, I have an opinion on both topics
1. Migraine - What you are describing is called an acephalagic migraine. More commonly, it is called a visual or optic migraine. This is when you have the visual aura of a classic migraine without the headache. You can also experience a blackening of vision as opposed to the light sensations.
2. Optic Neuritis - This is a tough one. You certainly describe symptoms of ON and it is possible to have mild ON without us being able to see inflammation when we look in your eyes. The Uthoff's sign you describe is classic for inflammation of the nerve. All that being said, nothing is 100%. I would be curious to know what the ophthalmologist you visited saw with your peripheral vision.
The other vision problems you describe sound pretty nonspecific. I'll tell you that I experience some strange symptoms like that myself. I don't have a good "eye doctor" explanation for it. it just is
Keep your chin up. There are other things out there that cause wonky problems with our eyes that are not MS. Sometimes we have things we cannot explain. Try to not self diagnose yourself to the point of worrying yourself sick.