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Retinal Scan

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Retinal Scan is one of the oldest biometrics from several existing biometry technologies. In 1930 research proposed a technology that can detect blood vessels in the lining of the eye. But this technology requires a very long time to use and precisely in 1984 this tool began to be developed and used by certain companies.

The understanding of the retinal scan itself is one of the biometric technologies that has a fairly high degree of accuracy that is able to examine the lining of the blood vessels behind the lining of the eye.

But the accuracy of the retinal scan itself can decrease if there is interference with the lining of the eye. For example, if the eye has started to nearsighted or severe again (cataracts) then the tool used to detect can not recognize the identity of the user.

Retinal Scan is a biometric technology that works on the back of the lining of the eye. Retinal Scan until now its use is still very rare, maybe because of the very high cost and most people think, using this technology can cause eye disorders.

It is recognized that all technologies are not perfect but not Retinal Scan technology, but by using this technology the user’s identity will be very difficult to duplicate. Not only that, the technology can be very accurate in verifying that the user has shown his identity. In addition this tool is not like an identity card that can be stolen or even removed.

This retinal scan is operated through a digital device that is able to detect quickly and through infrared or light (light) then the tool will automatically bring up the user’s identity or biodata.

Different from other biometrics technology. This technology works with the membranes of the back of the eye and through the nerve cells of the eye the detection tool will know the user of the retinal scan but usually takes about 10-15 seconds to check the nerves that have been paired with a retinal scan. This technology has been used in the USA in the military began in 1984. They use this tool to maintain their security access from terrorists and other bullies. As in the military they also apply this technology in the CIA, the FBI, NASA, and even federal jailed cooks located in rural Texas. They use this tool to protect their security.

Retinal Scan has a weakness (error). The retina can be read error if the reading does not match the sensor gauge requires a security center that can determine whether a request will be approved or rejected. This approach is very easy because retinal scans are only maintained in a single location. One disadvantage is that central access control can be a single point of failure. If the central access control is broken, then all objects will not be accessible. Another negative impact is the performance problem, if the system cannot fulfill all requests from the user (user). Then you can choose several packages that are commonly used in implementing administration of the access control. Example of the error.

Retinal scans map the unique patterns of a person’s retina. The blood vessels within the retina absorb light more readily than the surrounding tissue and are easily identified with appropriate lighting.

A retinal scan is performed by casting an unperceived beam of low-energy infrared light into a person’s eye as they look through the scanner’s eyepiece. This beam of light traces a standardized path on the retina.

Once the scanner device captures a retinal image, specialized software compiles the unique features of the network of retinal blood vessels into a template. Retinal scan algorithms require a high-quality image and will not let a user enroll or verify until the system is able to capture an image of sufficient quality. The retina template generated is typically one of the smallest of any biometric technology.

Retinal scan is a highly dependable technology because it is highly accurate and difficult to spoof, in terms of identification.  The technology, however, has notable disadvantages including difficult image acquisition and limited user applications.  Often enrollment in a retinal scan biometric system is lengthy due to requirement of multiple image capture, which can cause user discomfort.  However, once user is acclimated to the process, an enrolled person can be identified with a retinal scan process in seconds.

Retinal scan technology has robust matching capabilities and is typically configured to do one-to-many identification against a database of users. However, because quality image acquisition is so difficult, many attempts are often required to get to the point where a match can take place.

While the algorithms themselves are robust, it can be a difficult process to provide sufficient data for matching to take place. In many cases, a user may be falsely rejected because of an inability to provide adequate data to generate a match template.

Because retinal blood vessels are more absorbent of log-energy infrared light than the rest of the eye, the amount of reflection varies during the scan. The pattern of variations is converted to computer code and stored in a database. Retinal scans should therefore not be confused with another ocular-based technology, iris recognition, which is described as the process of recognizing a person by analyzing the random pattern of the iris.

The retina’s intricate network of blood vessels is a physiological characteristic that remains stable throughout the life of a person. As with fingerprints and iris patterns, genetic factors do not determine the exact pattern of blood vessels in the retina. This allows retinal scan technology to differentiate between identical twins and provide robust identification.

The retina contains at least as much individual data as a fingerprint, but, unlike a fingerprint, is an internal organ and is less susceptible to either intentional or unintentional modification. Certain eye-related medical conditions and diseases, such as cataracts and glaucoma, can render a person unable to use retina-scan technology, as the blood vessels can be obscured. – Rawlson King

Retinal scans are often used in health scanning procedures — to identify communicable diseases including AIDS, chicken pox and malaria — and to scan for hereditary diseases including various types of cancers. The scan itself poses no threat to the eye or to your overall health, though users of retinal scans complain of discomfort from the technology as they must lean in and keep their eye close to the machine for 30 seconds in order for a scan to be accurate.

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