Don't worry,graves eye disease is not contagious.First of all,you should know that its symptoms including weight loss,fatigue,brittle hair,rapid heart beat,hard to sleep and anxiety.If you have these symptoms,you should be careful then.By the way,I don't mean that this disease is contagious,I am just telling you how to tell grave eye disease.It is an auto immune disease.When you get this,your body's white blood cells is attacking other normal's.And then you will have bulging eyeballs.You should remind your roomie to go to the doctor often.It is not a serious disease,but you need to take care.