Retinal scan devices are probably the most accurate biometric available today. The uniqueness of the retinal pattern and the difficulty in counterfeiting such a device also make it a great long-term, high-security option.
Among its advantages are its low occurrence to false positives or negative rates. It is also highly reliable since no two people have identical retinal patterns. Also, the pupil, like the fingerprint remains a stable physiological trait throughout ones life. The retina is located deep within one's eyes and is highly unlikely to be modified. Its resistance to false matching is due to the fact that retinal scans produce patterns that have highly distinctive characteristics, sufficient to enable identification.
Besides, one of its major advantages is the fact that retinal scans provide speedy results, since the identity of the user is verified very quickly.
However, as history and science have both proven, no technology is infallible.
References:
http://www.cse.msu.edu/
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