ON is not a constant state. It means that he has an attack (or attacks) and didn't realize it or didn't say anything.

The fact that the pallor of the nerve is good, but a few things puzzle me. I don't understand why they didn't do a visual field test now, so they have something to compare and also how the doctor is sure he's not in the midst of an attack right now. At least in textbook cases of ON, it usually have a curve; sx present when it begins, then new ones present and then as recovery occurs, it kind of rewinds.

I would suggest you calling the doctor to shed some more light on the report and ask what tests were done. (I'm wondering if he used OCT, but not even all neuro-ops have that piece of equipment. )

I don't remember you saying what led him to the eye doctor in the first place. Was this just a normal check-up or did he go because his vision was blurry?