On just a normal exam they can only see the TIP end of the optic nerve. The nerve itself is about 2 inches long, and one tip hits the back side of your eye ball, and the other the front side of your brain. If they look in your eye, they can only see that front tip. Its great that he saw no indication of swelling, or other issues, but if it keeps up, you may need a more indepth exam. MRI is one of the only ways to see the whole nerve.

I do hope you feel better. it stinks to have eye pain. I know.