So... something that I don't often broadcast to fellow seafarers is that I don't actually see all that too well sometimes...
I'm 32 in a couple of weeks and had Cataracts removed when I was 21... Young, but not the youngest Pirate to go through the surgery. As a result of it I have fixed focal length in both eyes - the left sees short distance and the right long, or it should had I not suffered a secondary Cataract a couple of years ago that took some distance out of the vision!
Anyways, due to the Cataract surgery and a couple of other random complaints with my eyes I have mixed vision depending on light, fatigue, time played and of course - floaters - a term used to describe cells you can actually see floating around your eyes - most have these, but for some it is a problem as your eye doesn't always drain them.
My point to this post is thus - do you have any condition or complaint that makes the game hard to see, but that Rare can't really fix? For me it's those pesky birds signalling a sunken ship, as for me they either disappear due to the LOD and draw distance (can be fixed), or they may look inadvertently like something in my field of vision!