What physical characteristic does a retinal scan biometric device measure?
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The retina, a thin nerve (1/50th of an inch) on the back of the eye, is the part of the eye which senses light and transmits impulses through the optic nerve to the brain - the equivalent of film in a camera.
Blood vessels used for biometric identification are located along the neural retina, the outermost of retina's four cell layers.
The following answers are incorrect: The amount of light reaching the retinaThe amount of light reaching the retina is not used in the biometric scan of the retina.
The amount of light reflected by the retinaThe amount of light reflected by the retina is not used in the biometric scan of the retina.
The pattern of light receptors at the back of the eyeThis is a distractor The following reference(s) were/was used to create this question: Reference: Retina Scan Technology.
ISC2 Official Guide to the CBK, 2007 (Page 161)
A retinal scan biometric device measures the pattern of light receptors at the back of the eye, which is known as the retina. The retina is a thin layer of tissue that lines the back of the eye and contains specialized cells called photoreceptors. These photoreceptors convert light into electrical signals, which are then transmitted to the brain through the optic nerve.
Retinal scan biometric devices use a low-intensity light source, such as an infrared beam, to illuminate the retina. The light is absorbed by the photoreceptors in a unique pattern, which is then captured by a digital camera or scanner. The device then analyzes the pattern of the blood vessels in the retina, which is unique to each individual and does not change over time. This pattern is stored as a biometric template, which can be compared against other templates to verify a person's identity.
It is important to note that retinal scans are considered one of the most accurate forms of biometric authentication, as the pattern of the retina is unique to each person and cannot be easily replicated. However, retinal scans can be invasive and uncomfortable for some people, as the device must be positioned very close to the eye. Therefore, retinal scans are typically used in high-security environments, such as military installations and government buildings, rather than everyday applications.