See also Retina, Iris recognition, Iris, Eye vein verification, Biometric authentication, Fingerprint recognition, Facial recognition, Apple Face ID, Microsoft Hello, Personal identification number (PIN), Password

Snippet from Wikipedia: Retinal scan

A retinal scan is a biometric technique that uses unique patterns on a person's retina blood vessels. It is not to be confused with other ocular-based technologies: iris recognition, commonly called an "iris scan", and eye vein verification that uses scleral veins.

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