Newbie that Needs Reassurance

I'm told that I'm right on the 'edge' or right on the line for glaucoma - borderline.   I have no vision in left eye due to a retinal detachment at age 10.  My good eye has been for the most part good until I turned 55, 6 months ago.   I've had 2 visual field tests and some tests this week to measure cornea, etc.  I'm told my 'rimming' is good whatever that means and my vision is about 20/30 in this eye.   I am on Timolol but Dr.