I just went for testing, because I had over-pressure in my left eye.
I've been taking drops for it for a few years now (one drop in the morning). Today, the test showed that the pressure was up again, 25 where it should have been 20 (that's millimeters of mercury). So I was prescribed an additional eye drop, to be taken morning and evening.
The problem with eye over-pressure is that it would eventually damage the eye nerve. I already have very minor damage, the VFI is 96% (my right eye is 100%).
Reading the doctors charts, there was one for the left eye, and one for the right. I was about to ask which was which, and then I noticed that one was headed OD and the other OS.
I did Latin for four years, so I knew that was "Oculus Dexter" and "Oculus Sinister". Right eye and left eye.
While on the subject of health; I had a touch of psoriasis. Nothing serious, but it wasn't clearing up on its own, so I went to the doctor last week. He gave me clobetasone butyrate ointment, to be smeared on once per day, and Diprobase cream for a few times per day. That seems to have cleared it up very quickly.
Moral - if you have a problem, consult your GP.