iris code
n. A digital image of the iris, which is used to verify the identity of a person at a cash machine or checkpoint.
Just step up to the camera while your eye is scanned. And don't try to play tricks. The iris—the colored part of the eye the camera will be checking—is unique to every person, more so than fingerprints….

The system works like this: when a customer puts in a bank card, a stereo camera locates the face, finds the eye and takes a digital image of the iris at a distance of up to three feet.

The resulting computerized "iris code" is compared with one the customer will initially provide the bank. The ATM won't work if the two codes don't match.
—Alan Sayre, “Forget the PIN, just look into the camera,” The Associated Press, November 30, 1997
In 1992, Daugman, who is now a senior research fellow at Cambridge University, figured out how to turn an iris image into a 256-byte "iris code."
—Kevin McManus, “At Banks of Future, An Eye for an ID,” The Washington Post, May 06, 1996
1993 (earliest)
One new technology at the prototype stage is a 256-byte iris code that would not require direct eye contact, nor use of a PIN, and would have a throughput time of less than one second, says security consultant Richards.
—Sherry L. Harowitz, “Biometrics: more than meets the eye,” Security Management, February 01, 1993
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