When I write for myself, in my personal blog and elsewhere, I routinely begin by defining the terms I will be addressing. In order to have a useful discussion on any topic, it is important to agree on what it is that you are talking about.
I have long been uncomfortable with the various definitions of dry eye disease (DED). In some ways, definitions can be like mission statements, or at least they should be. Both should be simple and succinct. A mission statement can be partisan, espousing and promoting an agenda. A definition should not have a point of view. As much as possible, one should be