Biometrics is a means of identifying a person by measuring a particular physical or behavioral characteristic and later comparing it to a library of characteristics belonging to many people. Biometric systems have two advantages over traditional ID methods. First, the person to be identified does not have to present anything but himself. Second, the critical variable for identification cannot be lost or forged. Retinal identification is the most accurate of the biometric methods used at this time. It will replace traditional ID methods such as P.I.N. numbers for accessing A.T.M.s and virtually every other electronic device used for conducting business where identification is a requirement and prerequisite.