WordNet
retinal scanning
n. biometric identification by scanning the retina of the eye; "identification by retinal scanning is complicated by eye movements"
Usage examples of "retinal scanning".
But cerebral and retinal scanning were painless, and one never felt the acupuncture that deadened the leg for the blood, bone marrow, and tissue samples.
He stepped into a poorly lit corridor that ended in another set of steel doors, much newer, flanked with security keypads and a retinal scanning unit.