| Fingerprint method can be misapplied. This reality | | | | between the eyes and a scanner is needed. The |
| is proven scientifically correct. For that reason, | | | | appropriate position of eyes toward the scanner |
| people then try to find the more reliable biometric | | | | is also necessary. Also, there must be no eye |
| systems. | | | | movement, such as blink or glance. |
| The retina is part of the eyes that is responsible | | | | Retinal scanning can not be 100 percent accurate. |
| for the ability to see. The pattern of blood | | | | It is also less suitable as a security tool because |
| vessels that forms the retina is as unique as | | | | even though the pattern of capillary blood vessels |
| fingerprint. The principle of retinal scanning | | | | of human beings' retinas cannot change generally, |
| technology is scanning the pattern of capillary | | | | but diabetes, glaucoma, and cataracts can change |
| blood vessels on the retina with low-intensity light | | | | it. |
| sources. | | | | Iris scanning |
| In 1987, the first retinal scanner was made by | | | | In its development, retinal scanning is considered |
| Leonard Flom and Aram Safir and has been | | | | to be too disruptive in the case of security |
| patented. However, by the year 1994, John | | | | detection devices. In the use of retinal scanning, |
| Daugman developed the technology of iris | | | | the eyes should be as close as possible with the |
| scanning as a competitor for retinal scanner. | | | | scanner. For long-term, the light of scanner that is |
| Retinal scanning principle | | | | too close to the eye can give negative effects. |
| Retinal scanning is based on the fine capillary | | | | Because of the weakness, iris scanning technology |
| network that meets the needs of oxygen and | | | | emerges as strong competitor. Iris, a network |
| nutrients to the retina. These blood vessels | | | | that gives color to the eyes is also unique in which |
| absorb light and can easily be visualized with | | | | the chance for two identical slices is 1:1,078. Even, |
| appropriate lighting. To that end, the close distance | | | | the left iris and right iris of someone are different. |