The reason for this question is to pick up any inherited diseases that might apply to you. Although some glaucoma and heart disease are hereditary ie put you at increased risk, they are both very common and things that are tested in everyone ie an eye examination and an ECG. So in the UK you wouldnt be asked for any additional tests and it wouldnt be a problem provided you pass the normal tests. However, as we have seen before, some other countries have got strange ideas and go overboard.,so I cant speak for Germany - they might be a bit more rigorous, although I cant believe they would actually deny you a class 1
good luck and let us know if you have issues - we all like to learn