This has been a very informative thread. My husband has been on drops for over a year. He is religious about using them, but I've never knew that there were specific readings on the pressure. I've simply relied on him to let me know whatever details there are involved. Obviously he isn't keeping me up on those. This morning I going to ask him. I'm willing to bet his doesn't have a clue himself. He's a long way from being an informed patient and I don't blame his doctor.