I guess the only eye rupture I had ever heard of was as a result of a trauma. I remember a few unlucky patients when I worked at a teaching hospital with it. Things did not end well for them. I remember one who wound up with a nasty fungal infection by an invasive opportunistic mould. She lost both eyes. One to the trauma and one to the mould. It was a very sad case. Were the ones in your relatives Spontaneous?