The iris always stays the same. Iris scans video the eye’s colored area and use it to verify ones identity, like fingerprints, no two individual iris’s are alike. Iris scanning does not require that the person interact with the devise, they can stand as far away as three feet and still have it work. “Retinasafe-18” is installed on the dashboard or the door of the car & it allows the owner & 10 other people to register their fingerprints in its memory.