Hi 
    Definitely keep your hospital appointments.  They check for retinopathy by taking photos of the back of your eyes.  It can change really quickly as well, I had some retinopathy they thought was fine three months later I could not see out of my left eye.  I had an operation on it and although its a lot better some of my vision is blurred and distorted.  As soon as the operation was over I had laser on the other eye as they could see it was also advanced.  I could not see out of that eye shortly after and again had surgery.  I thought these things happened to older people ( I am 29) but the specialists say you are at risk from having advanced retinopathy about 20yrs after suffering from diabetes.