Learn in the textbookBiometric Authentication and Authentication Accuracy Metrics
DefinitionIris authentication (虹彩認証) uses a camera to read the fine pattern of the colored ring around the pupil (the iris) to confirm identity.
ExplanationIris patterns differ from person to person and barely change once formed in early childhood, so they are used for highly accurate biometric authentication. A camera can read them from a short distance, so users do not have to touch the device.
AnalogyIt is as if everyone were born wearing a one-of-a-kind handwoven pattern around the pupil that no one else shares.
Memory hookThe iris is named after Iris, the Greek goddess of the rainbow, and it is the colored ring around the pupil whose pattern this method reads.