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Iris recognition - Wikipedia
How do iris scans work? - Explain that Stuff
Human eye | Definition, Anatomy, Diagram, Function, & Facts
A Picture of the Eye - WebMD
Retinal vs. Iris Recognition: Your Eyes Can Get You Identified?
The Eyes Have It What is Iris Recognition? - Imageware
Biometrics - Retina and Iris Identification - GlobalSecurity.org
Retinal scan - Wikipedia
Recognition of Eye Characteristics | IntechOpen
Recognition-Based on Eye Biometrics: Iris and Retina