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Just give us some facts, it could be some interesting facts, or something informative like design of some engine, description of a place, some topic you study anything and every thing under the sun. Retina scan The retina is the neural part of the eye responsible for vision and the pattern of blood vessels serving the retina is as unique as a fingerprint. The technology that scans the retina is known as retinal scanning. The true target for the scan is the capillary pattern in the retina. The process relies on generating images of the retina using a low-intensity light source. In the 1930s retinal capillary patterns were suggested to be unique, but the technology used to exploit this information was developed much later. Although military and high-security use of photographic retinal scans began decades earlier, by 1985, retinal scan technology became available for computerized biometric identification and commercial security use. Retinal scans are just one of the biometric methods using the eye for personal identification. Two years after the first retinal scanner was developed in 1987, Leonard Flom and Aram Safir patented the use of the iris as a personal identifier. However, it was not until 1994 when John Daugman developed the technology for iris scanning that is became useful, and since then iris scanning has begun to challenge the retinal scans. Currently a number of companies claiming that they perform retinal scanning, in reality are performing iris scans. Retina scanning procedures. Retinal scans are based on the presence of the fine network of capillaries supplying the retina with oxygen and nutrients. These vessels absorb light and can be easily visualized with proper illumination. Retinal scans require close contact of user and scanner, a perfect alignment of the eye with a scanner, and no movement of the eye. The examiner is required to keep the subject's eye within half an inch of the instrument. The subject must focus on a pinpoint of little green light (to properly align the eye) and avoid blinking. A low-intensity coherent light is then transmitted through the eye and the reflected image of the retinal capillary pattern is recorded by the computer.