Iris scanning

Iris scanning is underpinned by the
fact that no two irises – the textured
coloured muscle that regulates the size
of your pupil – are identical. They
develop randomly in the womb, form fully
by eight months of age, and remain stable
throughout the rest of a person’s life.
During an iris scan, a CCD digital camera takes a
high-contrast picture of your eye using both visible and
near-infrared light. The iris is located in the image via
landmarks including the pupil edge and eyelids, and
pattern-recognition software maps the iris’s distinct
structure of furrows, speckles and ridges.
Iris-recognition systems are among the most accurate
of all biometric technologies, and offer more than 200
reference points for comparison (compared to 60 to 70
points in fi ngerprints). Iris scanning should not be
confused with retinal scanning, which compares the
patterns of blood vessels on the back of the eye.