Hmm. Working at a deficit because we don't know the whole situation but did he not get a visual field test at this appointment?

It's like a video game -- you stare at a screen and after they measure the eye, lights flash around and you press a button when you see them appear. It literally shows you the field of vision. If you look at the print out, you will see little black spots that indicate where the deficits are. If/as vision improves, you will see these black spots lessen or disappear in subsequent tests. (Except for where your optic nerve is, which will always be dark! )