NEXUS uses iris scanners [1] for biometric identification. In fact, pretty much anything that is reported as using a 'retina' scan is probably not, and is also an iris scan. Retinas are pretty useless as a biometric, and are quite hard to scan without opthamological equipment. Irises have the dual benefits of being unique to the individual, and visible on the outside of an individual.
Thanks for that clarification! I honestly never considered that technical aspect of the scans, as I do not have Global Entry, and I didn't know that retina scans are technically infeasible to utilize for ID purposes. You've given me something further to research: are iris scans harder to defeat with false information (like specialized contacts) than fingerprint scans (with whatever the hell they can be falsified with). There goes my morning! :)
NEXUS uses iris scanners [1] for biometric identification. In fact, pretty much anything that is reported as using a 'retina' scan is probably not, and is also an iris scan. Retinas are pretty useless as a biometric, and are quite hard to scan without opthamological equipment. Irises have the dual benefits of being unique to the individual, and visible on the outside of an individual.
[1] http://usa.immigrationvisaforms.com/travel/nexus-iris-scan-l...