Aha, thank you Coca.
Since posting I have looked at a lot of peoples eyes (and made some women blush accidentally) and it seems natural for a blue eyed person to have a blue ring form around the iris,
All my family and me have the blue ring around the eye and there is no history in the family of hereditary wekanesses of the heart. A bright reddish or orange ring would make more sense.
Thank you Coca. This forum isn't really bustling but at least you are replying to my question

.