No, the disposable contacts are not used again which will be bad for your eyes. You'd better not use them any more. The contact lenses are the products which could be used directly on the surface of the eyeballs. You should take notice of the hygiene. You'd better strict to the regulations of using time of each type of the contact lenses. About the week contact lenses, monthly contact lenses, half a year contact lenses and yearly contact lenses, you should use within the expired time. In addition, you should clean the contact lenses often in the solution which will get rid of the bacterium for you. At the same time, you should use some eye drops to moisture the eyes. In a word, you should use the contact lenses in the proper way.