Lol, I think you should know the answers before asking this question here. Because you know if we can often wear old contacts, there is no need for the experts to design the contacts only for one months, three months or six months. We should know that different kinds of contacts have different material, especially the contacts those can be used for long tine, including the one year. If you always wear the old contacts, your eyes are likely to get infection, because some chemical attached the lenses will release some harmful items into our eyes, then the eyes will get infection. Apart from eye infection, the eyes are also easily get the dry eyes if you wear the old contacts, especially when you wear them again and again. All in all, you should remember that there are every reason that you can not wear the old contacts.
