RETINALSCAN
Retinal scan
A retinal scan, commonly confused with the more appropriately named "iris scanner", is a biometric technique that uses the unique patterns on a person's retina to identify them. It is not to be confused with another ocular-based technology, iris recognition. The biometric use of this scan is used to examine the pattern of blood vessels at the back of the eye.The above text is a snippet from Wikipedia: Retinal scan
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