When I took my physical assessment course years ago, I practiced fundiscopic exams on any willing victim... er.. volunteer. I saw changes in my mom's eyes and told her she needed to have her BP checked.
I told this to my opthamologist who reminded me that those are the only blood vessels we can actually see, and any changes there are a reflection of the entire body.
So if you haven't had a good eye exam lately, I encourage you all to do it! The technology now is AMAZING.