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Eye-scanning technology is becoming increasingly pervasive as a biometric technique for individual identification, both in Hollywood ("Minority Report" and other films) and in real-life (an India case study that I wrote about last September, for example, or its use by NATO troops in Afghanistan). The generic term actually encompasses two different pattern-recognition implementations:

Recent news, however, raises fundamental questions regarding the techniques' effectiveness. First came the results of a recent study at Notre Dame, which I came across at both DailyTech and Slashdot, which concluded that iris patterns do indeed change over time. A failure percentage increase of 153% over three years sounds dramatic, until you realize that this translates into an absolute failure increase from 1 per 2 million to 2.5 per two million. Still, when you consider that roughly 200 million individuals have already been iris-scanned in India alone, the failure rate becomes more notable.

More recently, thanks again to Slashdot (along with The Verge and Wired), I learned that (akin to photographs that fool facial recognition systems) it's possible to use a fine-detailed image of the eye to spoof biometric scanners. Researchers at the Universidad Autonoma de Madrid (UAM), Spain, created synthetic iris images that were able to fool an eye-scan security system more than 80 percent of the time. Interestingly, at least to me, the coverage at The Verge notes:

For security purposes, iris-scanning machines don't keep actual images of a verified person's eye. Instead, they use nearly 5,000 points of data on the unique aspects of person's iris to check against later.

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