I realize that, for those of us with non-retina monitors and degraded visual acuity, the Apple system fonts are going to pose a consistent problem. One of the ways to help with this is to use the zoom function, but as a writer and editor I often shift between notes, requiring not only a click on the new note, but multiple clicks on the zoom combo to make it visible, doing what needs to be done and then returning to the original note which now needs to be zoomed again. If this were just an occasional operation, it wouldn't be so irritating, but continuously having to bracket a simple task with 3 zoom clicks on either side gets tedious.
It would be very nice if there were a way to set a global zoom level that would not involve changing the type size. What I have in mind is an item in preferences that could be set for the display without affecting the print output.