never saw it ... but those non-military ones are a pain in the ass ... u need to present ur eye in the EXACT same position relative to the sensor each time it cost too much to add loads of sensors for a quick multiangle scan
fingerprint scanners are pretty good tho .. but still take 2-3 attempts to access w/o practice
just remember all these simply tie into the login system and pass credentials on a verfication of a valid scan sample l0phtcrack and a sam file can still allow access to ur puter using a password
