Which of the following eye scan methods is considered to be more intrusive?
A.
Iris scans
B.
Retinal scans
C.
Body scans
D.
Reflective scans
Explanation:
There are two types of eye scan in use today for authentication purposes: retinal scans
and iris scans. Retinal Scan technology maps the capillary pattern of the retina, a
thin (1/50th inch) nerve on the back of the eye. To enroll, a minimum of five scans is
required, which takes 45 seconds. The subject must keep his head and eye motionless
within 1/2″ of the device, focusing on a small rotating point of green light. 320 – 400
points of reference are captured and stored in a 35-byte field, ensuring the measure is
accurate with a negligible false rejection rate.
This compares to 30-70 points of reference for a finger scan. Unfortunately a retinal
scan is considerably more intrusive than an iris scans and many people are hesitant to
use the device [Retina-scan]. In addition a significant number of people may be unableto perform a successful enrolment, and there exist degenerative diseases of the retina
that alter the scan results over time. Despite these disadvantages, there are several
successful implementations of this technology [Retina-scan].