Yes, of course. The contact lenses have its expiration periods, if you wear it too long, the function of sterilization will disappear, and the anti-virus function will go out. The contacts will be easy to get pollution from the outside environment, pink eyes will be happen. Pink eye is the common name of the disease infectious conjunctivitis. It is an acute infectious eye inflammation which possibly infected through articles contacts of patients, this disease would happen all the year around but especially find more in spring and summer in public places. Actually, it's easy to get but still have way to protect. Good health habit would prevent the bacteria or viruses pass through hands to eyes. Please washing hands before dinner and after toilet, pay attention your personal hygiene and make sure of frequently clean, to avoid using hands rubbing your eyes are also very important. In the disease prevalent season, please reduce the times go out to public gatherings and the antiviral eye drop is also useful after swimming. The contact lenses' clearance is very importance for your eyes protect.