I ask my clients to provide edits via PDF comments. Even as a person with normal vision, it is hard to tell which comment bubble is presently active (e.g. via clicking on a comment in the side panel). On images or busy pages it can become like an advent calendar search. The contrast of the bubble background and its dotted border are inadequate (even with opacity set to 100). Contrast between inactive and active (selected) comment bubble needs to be vastly improved, perhaps by size and not just colour.

I would use the PDF comments import in InDesign instead but every time I click on a comment it zooms out my page such that I can't comfortably read my text. (I've submitted feedback on this item.)