What is the risk of wearing disposable contacts for longer than you are supposed to?

Allergy : It is known that the people who wear their contact for a long period of time they tend to have higher risk for developing allergic conjunctivitis. The material for contact lens changes with time and becomes sticky. If you wear cl for a long period you may build up protein and other material which could be allergenic to the eye. Its re commanded to throw away you contact sooner not later.