How Much Does Eye Pressure Fluctuate?

 For the first two years after I was diagnosed with glaucoma, I had my eye pressure checked once every six months. I was under the impression that eye pressure is fairly steady and that large fluctuations are unusual. I certainly did not expect that I would experience very large fluctuations in eye pressure within very short periods of time (such as minutes). However, fluctuations in my eye pressure are something I have observed frequently over the course of collecting more than 18,000 eye pressure measurements.