Two years ago I just got off a 7 day cruise, and a few days later had a severe detached retina in one eye. Had to go through multiple laser surgeries.. plus had the other eye lasered for prevention. I was so thankful it didn't happen on the cruise.. But I now know what to expect if it happens again, and a little relieved that there are ports with Doctors that can handle this. This may have been a weird question OP had, but for those of us who are at risk it is good to know other experiences and thoughts on the subject.