From "Review of Ophthalmology":
most human IOP measurements are “snapshot” measurements—a single reading taken periodically in a doctor’s office. Any conclusions about the nature and impact of fluctuation have therefore been largely based on very sketchy evidence.
That statement, from a 2011 article by the Senior Editor of "Review of Ophthalmology," captures the motivation that lead to the creation of FitEyes six years ago and that has continued to motivate our engagement with high frequency home eye pressure monitoring (where we recommend multiple measurements per day).
The article can be found here: http://www.revophth.com/content/c/28662/