Which of the following are the types of eye scan in use today?
A.
Retinal scans and body scans.
B.
Retinal scans and iris scans.
C.
Retinal scans and reflective scans.
D.
Reflective scans and iris 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 unable to 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].