With the introduction of Iris scan on a smartphone by Samsung, Iris scan has become more popular now. On a smartphone, initially we had no locks then we had password, later on finger-print scanners. Now, to reach the higher level of security we have IRIS scanner on a smartphone.
There is still a subtle confusion among people between iris scan and retina scan. So, let’s see the difference.
Retina: it’s the thin layer that is on the inner back of the eye. The thing is even identical twins do not share the same pattern of retina. However the retina patterns can be changed in case of diabetes or degenerative disorders of the retina.
How a retina scan works?? A retinal scan is performed by sending out an unobserved low-energy infrared light beam into a person’s eye as they look into the scanning device. This beam of light traces the systematized path of the retina. As the blood vessels of the retina are more light absorbent than the rest of the eye, the amount of reflected light varies during scanning. The result received is the pattern of those variations. And that received pattern is the unique identity or life saver or atleast information saver;)
Retina scan requires a very close encounter with the scanning device, that might be one the reasons why a retina scan is not preferred on smartphones.
Iris scan: Unlike retina, iris is flat, ring-shaped tissue behind the cornea of the eye. The color of the iris defines the eye color.
How an Iris scanner works?? Iris recognition uses video camera with infrared illumination (NIR) on the smartphone or any iris scanner to capture images of the structures of the iris.The images are turned into digital templates and stored. These templates provide a mathematical representation of the iris. It represents a unique identity.
Iris texture always remains extremely stable, doesn’t change at all, because it is internal and protected.Moreover Iris scan can be done from a distance, that is one of the reasons why an iris scan is being used on smartphones.