Yea, wearing contacts for a too long time is bad for your eyes. Contact lenses are designed to be worn on a monthly, bi-weekly, or daily schedule. When you wear the contacts over the recommended amount of time, the material of contacts begins to deteriorate. And the increasing amount of protein deposits on the lens will lead the lens to become cloudy and less clear. You know, oxygen transmission is critical for the health of the cornea. However, too long time wearing contacts will impede the oxygen transmission and deprive the cornea of oxygen, as a result of which corneal ulcer, corneal infiltrate, infection, corneal neovascularization, corneal edema would develop. Most of these problems are serious and can lead to loss of vision. Therefore, wear your contacts in the recommended amount of time.