At an airport, for example, a person's name and airline information accompanies the iris code, but to protect people's privacy no further data -- a Social Security number, for example -- is collected. The stored file is only 512 bytes with a resolution of 640 x 480, allowing for massive storage on a computer's hard drive. Manufacturers of the technology say they have made assurances that the databases will not be shared with other organizations.
Glasses and contact lenses, even colored ones, do not interfere with the process. In addition, recent medical advances such as refractive surgery, cataract surgery and cornea transplants do not change the iris' characteristics. In fact, it is impossible to modify the iris without risking blindness. And even a blind person can participate. As long as a sightless eye has an iris, that eye can be identified by iris recognition.
The camera can be set at a distance of four inches (10 centimeters) to 40 inches (one meter), depending on the scanning environment. When iris recognition is used for logging on to a personal computer or checking in at an airport, people need to be somewhat closer to the camera. An automatic cash machine, on the other hand, does not require such nearness.
Cost has been the biggest deterrent to implementing the technology, said Johnston, but it is now becoming more affordable for companies ranging from security firms to airports to incorporate.
Evan Smith, EyeTicket's senior vice president, said his company has also developed a system of doors in response to a recent security concern raised by the Federal Aviation Administration.
The matter arose when the iris-recognition software was implemented for security purposes around the airport terminal, designed to allow only authorized people to enter certain areas. But the FAA found that an unauthorized person had time to dash in behind an authorized person once the iris-recognition allowed access -- a practice it termed "piggybacking" or "tail-gating."
EyeTicket will install revolving doorways, the first of which was unveiled Monday at the Charlotte/Douglas airport, to stop that practice, officials said. The first door opens upon iris recognition and then closes behind the person, leaving them in a small portal. The next door will only open upon confirming there is just one person in the portal.