Why guess about your eye pressure when you can know?
I have had my tonometer for almost 6 months. It has answered a multitude of questions about how my daily routine affects my health. I didn't know, for example, that just taking a walk outside for a half hour or so would reduce my eye pressure, sometimes by as much as 50%. I also didn't know that I wasn't one of the people whose pressures are higher at night--in fact my lowest pressures are at night. (That was good news. I was tired of sleeping with my head elevated).
I have found no supplements that had any effect on lowering my IOP, but I have found that some supplements will raise my IOP quite significantly. I know that out of control thoughts and periods of stress significantly raise my IOP in spite of the two drops I am using or any other healthy lifestyle choices I am making.