Retinal Scan Biometric Identification Method
Retinal scans examine the blood vessel patterns of the retina, the nerve tissue lining the inside of the eye that is sensitive to light.
An infrared light source is used to illuminate the retina of the eye. The image of the enhanced blood vessel pattern of the retina is analysed for characteristic points.
A retinal scan can produce almost the same volume of data as a fingerprint image analysis.
Retinal scan technology has several drawbacks. The retina is susceptible to disease (notably cataracts) that can change the characteristics of the eye and the method of obtaining a retinal scan is personally invasive - a laser light (or other light source) must be directed through the cornea of the eye.
Obtaining a correct retinal scan depends heavily on the skill of the operator.