1. A system for tracking position and movement of a contact lens on a wearer's eye comprising: a camera constructed and arranged to acquire a first image of the eye using a first illumination and a second image of the eye using a second illumination, allowing viewing of a pupil and a limbus of the eye; at least one vision system tool constructed and arranged to: a) determine a location of the pupil and a location of the limbus in the second image; and b) determine a location of the contact lens in the first image; and a graphical user interface that displays a visible image of the eye and includes overlay graphics showing the location of the contact lens and the location of the pupil and the limbus with respect to the contact lens.