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

Snippet from Wikipedia: Eye vein verification

Eye vein verification is a method of biometric authentication that applies pattern-recognition techniques to video images of the veins in a user's eyes. The complex and random patterns are unique, and modern hardware and software can detect and differentiate those patterns at some distance from the eyes.

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