Hi,
I have had O.N. with ice pick stabs and some without pain. I usually have loss (blurry) of my central vision, with a scotoma (sp?). I view a big yellow circle, and the vision is blurry inside the circle.
One time it stayed the same and got better after two weeks, and just when I thought it was gone, it came back for 12 more days. Under doctor care though.
Other times, I have had the same central vision loss, but yes only milder, (yellow is blanched) then it goes away in a week or two. I don't think mine is as bad as some people get, because the eye doctor and Neuro said no steroids.
I always need a doctor's advice on a Friday or Saturday too, it never fails. I would have it checked, as soon as possible on Monday, even if slight blurring occurs.
Unless you usually go to the ER in your country for these things, perhaps you can wait until Monday. If it worsens, than get to the ER.
Some people get total vision loss in the O.N. eye. I don't. Do you?
Never fool around with your eyes or your mobility, if there is a change. Go see or call your doctor. I hope your eye gets better soon.

Good luck to you.