Timolol Daily Once Each Eye Controlling Eye Pressure But Some

Timolol daily once each eye controlling eye pressure but some "wall" is thinning making it necessary to lower eye pressure more.. like down to 11,10 9 or something . where does this sound like I'm at in the progression of glaucoma? due another pressure test end of April and a field of view test. Dr oor tech didn't say anymore than I'm telling you. oops. can't pay for answer.