Most popular biometric time clocks today use optical scanning technology to recognize employees’ fingerprints. The scanner uses an LED light to illuminate the finger – it creates the fingerprint image by determining the light and dark areas created by the fingerprint ridges. Unfortunately, the accuracy of optical scanner is limited. Since it scans a small surface of the fingertip, oftentimes the saved image does not match the actual finger unless employee places it on the scanner the same exact way when it was initially enrolled. Manually re-positioning fingers to get the right reading can be time-consuming and leave employees and supervisors frustrated. Certain groups of population, like the Elderly tend to have difficult time with fingerprint readers in general. With age, our skin begins to lose elasticity which can affect how well a fingerprint image scanner works. Other groups that may have a tougher time include people that work a lot with their hands or that have especially dry or oily skin. It is estimated that Fingerprint
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