FYI I am posting this so you might avoid what happened to me. About two years ago during an eye exam I was told I had glaucoma, so the doctor prescribed drops. I found it hard to believe, because all my previous pressure readings were low, but my doctor dismissed my concern that the one high reading was because I drank mucho coffee before the exam. I ended up using the prescribed drops----until CRPS intervened and I was too ill to deal with getting another prescription for the drops.