Annual contact lens examinations are necessary for maintaining the health of your eyes. Each year, it is important to make sure that your lenses are still fitting properly and that your eyes are receiving enough oxygen. In Colorado, contact lens prescriptions expire one year from the date of your fitting. The contact lens fitting is an additional step in the eye exam and is used to determine the centering and movement of your contacts on your eyes, as well as measuring the curvature of your cornea. There are many different types of contact lenses and the goal of the fitting is to find the most appropriate contacts for your optimal eye health, vision, and comfort. Contact lens fitting fees vary, depending upon the complexity of your fit.